datacite: adding datacite-specific extra metadata

* attributes.metadataVersion
* attributes.schemaVersion
* attributes.version (source dependent values, follows suggestions in
https://schema.datacite.org/meta/kernel-4.3/doc/DataCite-MetadataKernel_v4.3.pdf#page=26,
but values vary)

Furthermore:

* attributes.types.resourceTypeGeneral
* attributes.types.resourceType

30 files changed, 1570 insertions, 1468 deletions

diff --git a/python/tests/files/datacite/datacite_doc_20.json b/python/tests/files/datacite/datacite_doc_20.json
index 964e2cbb..cc6cc1fb 100644
--- a/python/tests/files/datacite/datacite_doc_20.json
+++ b/python/tests/files/datacite/datacite_doc_20.json
@@ -1,42 +1,41 @@
 {
-    "attributes": {
-      "doi": "10.7916/d86x0cg1",
-      "creators": [
-        {
-          "name": "(:Unav)",
-          "affiliation": [],
-          "nameIdentifiers": []
-        }
-      ],
-      "titles": [
-        {
-          "title": "<h1>Eastern questionnaire</h1>"
-        }
-      ],
-      "publicationYear": 2017,
-      "dates": [
-        {
-          "date": "2017-08-24",
-          "dateType": "Created"
-        },
-        {
-          "date": "2019-08-04",
-          "dateType": "Updated"
-        },
-        {
-          "date": "2017",
-          "dateType": "Issued"
-        }
-      ],
-      "language": null,
-      "types": {
-        "ris": "GEN",
-        "bibtex": "misc",
-        "citeproc": "article",
-        "schemaOrg": "CreativeWork"
+  "attributes": {
+    "doi": "10.7916/d86x0cg1",
+    "creators": [
+      {
+        "name": "(:Unav)",
+        "affiliation": [],
+        "nameIdentifiers": []
+      }
+    ],
+    "titles": [
+      {
+        "title": "<h1>Eastern questionnaire</h1>"
+      }
+    ],
+    "publicationYear": 2017,
+    "dates": [
+      {
+        "date": "2017-08-24",
+        "dateType": "Created"
       },
-      "isActive": true,
-      "state": "findable"
-    }
+      {
+        "date": "2019-08-04",
+        "dateType": "Updated"
+      },
+      {
+        "date": "2017",
+        "dateType": "Issued"
+      }
+    ],
+    "language": null,
+    "types": {
+      "ris": "GEN",
+      "bibtex": "misc",
+      "citeproc": "article",
+      "schemaOrg": "CreativeWork"
+    },
+    "isActive": true,
+    "state": "findable"
   }
-  
\ No newline at end of file
+}
diff --git a/python/tests/files/datacite/datacite_doc_21.json b/python/tests/files/datacite/datacite_doc_21.json
index cae7f40f..04b196a6 100644
--- a/python/tests/files/datacite/datacite_doc_21.json
+++ b/python/tests/files/datacite/datacite_doc_21.json
@@ -1,42 +1,41 @@
 {
-    "attributes": {
-      "doi": "10.7916/d86x0cg1",
-      "creators": [
-        {
-          "name": "(:Unav)",
-          "affiliation": [],
-          "nameIdentifiers": []
-        }
-      ],
-      "titles": [
-        {
-          "title": "ABC"
-        }
-      ],
-      "publicationYear": 2017,
-      "language": "GERMAN",
-      "types": {
-        "ris": "GEN",
-        "bibtex": "misc",
-        "citeproc": "article",
-        "schemaOrg": "CreativeWork"
+  "attributes": {
+    "doi": "10.7916/d86x0cg1",
+    "creators": [
+      {
+        "name": "(:Unav)",
+        "affiliation": [],
+        "nameIdentifiers": []
+      }
+    ],
+    "titles": [
+      {
+        "title": "ABC"
+      }
+    ],
+    "publicationYear": 2017,
+    "language": "GERMAN",
+    "types": {
+      "ris": "GEN",
+      "bibtex": "misc",
+      "citeproc": "article",
+      "schemaOrg": "CreativeWork"
+    },
+    "dates": [
+      {
+        "date": "2017-08-24",
+        "dateType": "Created"
       },
-      "dates": [
-        {
-          "date": "2017-08-24",
-          "dateType": "Created"
-        },
-        {
-          "date": "2019-08-04",
-          "dateType": "Updated"
-        },
-        {
-          "date": "2017",
-          "dateType": "Issued"
-        }
-      ],
-      "isActive": true,
-      "state": "findable"
-    }
+      {
+        "date": "2019-08-04",
+        "dateType": "Updated"
+      },
+      {
+        "date": "2017",
+        "dateType": "Issued"
+      }
+    ],
+    "isActive": true,
+    "state": "findable"
   }
-  
\ No newline at end of file
+}
diff --git a/python/tests/files/datacite/datacite_doc_22.json b/python/tests/files/datacite/datacite_doc_22.json
index 42448ddf..365b1361 100644
--- a/python/tests/files/datacite/datacite_doc_22.json
+++ b/python/tests/files/datacite/datacite_doc_22.json
@@ -1,44 +1,43 @@
 {
-    "attributes": {
-      "doi": "10.7916/d86x0cg1",
-      "creators": [
-        {
-          "name": "Anton Welch",
-          "affiliation": [
-            "Department of pataphysics"
-          ],
-          "nameIdentifiers": []
-        }
-      ],
-      "titles": [
-        {
-          "title": "ABC"
-        }
-      ],
-      "publicationYear": 2017,
-      "language": "GERMAN",
-      "types": {
-        "ris": "GEN",
-        "bibtex": "misc",
-        "citeproc": "article",
-        "schemaOrg": "CreativeWork"
+  "attributes": {
+    "doi": "10.7916/d86x0cg1",
+    "creators": [
+      {
+        "name": "Anton Welch",
+        "affiliation": [
+          "Department of pataphysics"
+        ],
+        "nameIdentifiers": []
+      }
+    ],
+    "titles": [
+      {
+        "title": "ABC"
+      }
+    ],
+    "publicationYear": 2017,
+    "language": "GERMAN",
+    "types": {
+      "ris": "GEN",
+      "bibtex": "misc",
+      "citeproc": "article",
+      "schemaOrg": "CreativeWork"
+    },
+    "dates": [
+      {
+        "date": "2017-08-24",
+        "dateType": "Created"
       },
-      "dates": [
-        {
-          "date": "2017-08-24",
-          "dateType": "Created"
-        },
-        {
-          "date": "2019-08-04",
-          "dateType": "Updated"
-        },
-        {
-          "date": "2017",
-          "dateType": "Issued"
-        }
-      ],
-      "isActive": true,
-      "state": "findable"
-    }
+      {
+        "date": "2019-08-04",
+        "dateType": "Updated"
+      },
+      {
+        "date": "2017",
+        "dateType": "Issued"
+      }
+    ],
+    "isActive": true,
+    "state": "findable"
   }
-
+}
diff --git a/python/tests/files/datacite/datacite_doc_23.json b/python/tests/files/datacite/datacite_doc_23.json
index 1e5bcc3f..1dcdfc27 100644
--- a/python/tests/files/datacite/datacite_doc_23.json
+++ b/python/tests/files/datacite/datacite_doc_23.json
@@ -1,44 +1,43 @@
 {
-    "attributes": {
-      "doi": "10.7916/d86x0cg1\u2013xxx",
-      "creators": [
-        {
-          "name": "Anton Welch",
-          "affiliation": [
-            "Department of pataphysics"
-          ],
-          "nameIdentifiers": []
-        }
-      ],
-      "titles": [
-        {
-          "title": "ABC"
-        }
-      ],
-      "publicationYear": 2017,
-      "language": "GERMAN",
-      "types": {
-        "ris": "GEN",
-        "bibtex": "misc",
-        "citeproc": "article",
-        "schemaOrg": "CreativeWork"
+  "attributes": {
+    "doi": "10.7916/d86x0cg1–xxx",
+    "creators": [
+      {
+        "name": "Anton Welch",
+        "affiliation": [
+          "Department of pataphysics"
+        ],
+        "nameIdentifiers": []
+      }
+    ],
+    "titles": [
+      {
+        "title": "ABC"
+      }
+    ],
+    "publicationYear": 2017,
+    "language": "GERMAN",
+    "types": {
+      "ris": "GEN",
+      "bibtex": "misc",
+      "citeproc": "article",
+      "schemaOrg": "CreativeWork"
+    },
+    "dates": [
+      {
+        "date": "2017-08-24",
+        "dateType": "Created"
       },
-      "dates": [
-        {
-          "date": "2017-08-24",
-          "dateType": "Created"
-        },
-        {
-          "date": "2019-08-04",
-          "dateType": "Updated"
-        },
-        {
-          "date": "2017",
-          "dateType": "Issued"
-        }
-      ],
-      "isActive": true,
-      "state": "findable"
-    }
+      {
+        "date": "2019-08-04",
+        "dateType": "Updated"
+      },
+      {
+        "date": "2017",
+        "dateType": "Issued"
+      }
+    ],
+    "isActive": true,
+    "state": "findable"
   }
-
+}
diff --git a/python/tests/files/datacite/datacite_doc_24.json b/python/tests/files/datacite/datacite_doc_24.json
index 6123350b..4ea6945f 100644
--- a/python/tests/files/datacite/datacite_doc_24.json
+++ b/python/tests/files/datacite/datacite_doc_24.json
@@ -1,48 +1,47 @@
 {
-    "attributes": {
-      "doi": "10.7916/d86x0cg1",
-      "creators": [
-        {
-          "name": "Anton Welch",
-          "affiliation": [
-            "Department of pataphysics"
-          ],
-          "nameIdentifiers": []
-        }
-      ],
-      "titles": [
-        {
-          "title": "ABC"
-        },
-        {
-          "title": "DEF",
-          "titleType": "Subtitle"
-        }
-      ],
-      "publicationYear": 2016,
-      "language": "DE-CH",
-      "types": {
-        "ris": "GEN",
-        "bibtex": "misc",
-        "citeproc": "article",
-        "schemaOrg": "CreativeWork"
+  "attributes": {
+    "doi": "10.7916/d86x0cg1",
+    "creators": [
+      {
+        "name": "Anton Welch",
+        "affiliation": [
+          "Department of pataphysics"
+        ],
+        "nameIdentifiers": []
+      }
+    ],
+    "titles": [
+      {
+        "title": "ABC"
       },
-      "dates": [
-        {
-          "date": "2017-08-24",
-          "dateType": "Created"
-        },
-        {
-          "date": "2019-08-04",
-          "dateType": "Updated"
-        },
-        {
-          "date": "2017",
-          "dateType": "Issued"
-        }
-      ],
-      "isActive": true,
-      "state": "findable"
-    }
+      {
+        "title": "DEF",
+        "titleType": "Subtitle"
+      }
+    ],
+    "publicationYear": 2016,
+    "language": "DE-CH",
+    "types": {
+      "ris": "GEN",
+      "bibtex": "misc",
+      "citeproc": "article",
+      "schemaOrg": "CreativeWork"
+    },
+    "dates": [
+      {
+        "date": "2017-08-24",
+        "dateType": "Created"
+      },
+      {
+        "date": "2019-08-04",
+        "dateType": "Updated"
+      },
+      {
+        "date": "2017",
+        "dateType": "Issued"
+      }
+    ],
+    "isActive": true,
+    "state": "findable"
   }
-
+}
diff --git a/python/tests/files/datacite/datacite_result_00.json b/python/tests/files/datacite/datacite_result_00.json
index e76aa391..28da5397 100644
--- a/python/tests/files/datacite/datacite_result_00.json
+++ b/python/tests/files/datacite/datacite_result_00.json
@@ -1,88 +1,92 @@
 {
-    "extra": {
-        "container_name": "Journal of Chemical Crystallography",
-        "datacite": {
-            "license": [
-                {
-                    "rightsUri": "http://www.springer.com/tdm"
-                }
-            ],
-            "relations": [
-                {
-                    "relationType": "IsPartOf",
-                    "relatedIdentifier": "1074-1542",
-                    "resourceTypeGeneral": "Collection",
-                    "relatedIdentifierType": "ISSN"
-                }
-            ]
-        },
-        "month": 5
-    },
-    "title": "Synthesis and Crystal Structure of a Compound with Two Conformational Isomers: N-(2-methylbenzoyl)-N\u2032-(4-nitrophenyl)thiourea",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_date": "2019-05-31",
-    "release_year": 2019,
-    "ext_ids": {
-        "doi": "10.1007/s10870-008-9413-z"
-    },
-    "volume": "38",
-    "issue": "12",
-    "pages": "927-930",
-    "publisher": "Springer Science and Business Media LLC",
-    "contribs": [
+  "extra": {
+    "container_name": "Journal of Chemical Crystallography",
+    "datacite": {
+      "license": [
         {
-            "index": 0,
-            "raw_name": "Qian-Jin Li",
-            "given_name": "Qian-Jin",
-            "surname": "Li",
-            "role": "author"
-        },
-        {
-            "index": 1,
-            "raw_name": "Chun-Long Yang",
-            "given_name": "Chun-Long",
-            "surname": "Yang",
-            "role": "author"
+          "rightsUri": "http://www.springer.com/tdm"
         }
-    ],
-    "refs": [
-        {
-            "index": 0,
-            "extra": {
-                "doi": "10.1016/j.bmcl.2005.09.033"
-            }
-        },
-        {
-            "index": 1,
-            "extra": {
-                "doi": "10.1016/s0022-1139(02)00330-5"
-            }
-        },
-        {
-            "index": 2,
-            "extra": {
-                "doi": "10.1016/s0010-8545(01)00337-x"
-            }
-        },
-        {
-            "index": 3,
-            "extra": {
-                "doi": "10.1016/j.tetlet.2005.06.135"
-            }
-        },
-        {
-            "index": 4,
-            "extra": {
-                "doi": "10.1039/p298700000s1"
-            }
-        },
+      ],
+      "relations": [
         {
-            "index": 5,
-            "extra": {
-                "doi": "10.1002/anie.199515551"
-            }
+          "relationType": "IsPartOf",
+          "relatedIdentifier": "1074-1542",
+          "resourceTypeGeneral": "Collection",
+          "relatedIdentifierType": "ISSN"
         }
-    ],
-    "abstracts": []
+      ],
+      "resourceType": "JournalArticle",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-4",
+      "metadataVersion": 1
+    },
+    "month": 5
+  },
+  "title": "Synthesis and Crystal Structure of a Compound with Two Conformational Isomers: N-(2-methylbenzoyl)-N′-(4-nitrophenyl)thiourea",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_date": "2019-05-31",
+  "release_year": 2019,
+  "ext_ids": {
+    "doi": "10.1007/s10870-008-9413-z"
+  },
+  "volume": "38",
+  "issue": "12",
+  "pages": "927-930",
+  "publisher": "Springer Science and Business Media LLC",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Qian-Jin Li",
+      "given_name": "Qian-Jin",
+      "surname": "Li",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "Chun-Long Yang",
+      "given_name": "Chun-Long",
+      "surname": "Yang",
+      "role": "author"
+    }
+  ],
+  "refs": [
+    {
+      "index": 0,
+      "extra": {
+        "doi": "10.1016/j.bmcl.2005.09.033"
+      }
+    },
+    {
+      "index": 1,
+      "extra": {
+        "doi": "10.1016/s0022-1139(02)00330-5"
+      }
+    },
+    {
+      "index": 2,
+      "extra": {
+        "doi": "10.1016/s0010-8545(01)00337-x"
+      }
+    },
+    {
+      "index": 3,
+      "extra": {
+        "doi": "10.1016/j.tetlet.2005.06.135"
+      }
+    },
+    {
+      "index": 4,
+      "extra": {
+        "doi": "10.1039/p298700000s1"
+      }
+    },
+    {
+      "index": 5,
+      "extra": {
+        "doi": "10.1002/anie.199515551"
+      }
+    }
+  ],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_01.json b/python/tests/files/datacite/datacite_result_01.json
index 46be2515..956357b8 100644
--- a/python/tests/files/datacite/datacite_result_01.json
+++ b/python/tests/files/datacite/datacite_result_01.json
@@ -1,32 +1,36 @@
 {
-    "extra": {
-        "datacite": {
-            "license": [
-                {
-                    "lang": "de",
-                    "rights": "Standard (Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen) - http://www.ub.uni-heidelberg.de/helios/digi/nutzung/Welcome.html"
-                }
-            ]
-        }
-    },
-    "title": "Ferdinand Gaillard, [1]: n\u00e9 \u00e0 Paris le 16 janvier 1834, mort \u00e0 Paris le 19 janvier 1887",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_year": 1887,
-    "ext_ids": {
-        "doi": "10.11588/diglit.25558.39"
-    },
-    "publisher": "University Library Heidelberg",
-    "language": "fr",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "license": [
         {
-            "index": 0,
-            "raw_name": "G. Dargenty",
-            "given_name": "G.",
-            "surname": "Dargenty",
-            "role": "author"
+          "lang": "de",
+          "rights": "Standard (Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen) - http://www.ub.uni-heidelberg.de/helios/digi/nutzung/Welcome.html"
         }
-    ],
-    "refs": [],
-    "abstracts": []
-}
\ No newline at end of file
+      ],
+      "metadataVersion": 4,
+      "resourceType": "DigitalisatDigital copy",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-4"
+    }
+  },
+  "title": "Ferdinand Gaillard, [1]: né à Paris le 16 janvier 1834, mort à Paris le 19 janvier 1887",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_year": 1887,
+  "ext_ids": {
+    "doi": "10.11588/diglit.25558.39"
+  },
+  "publisher": "University Library Heidelberg",
+  "language": "fr",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "G. Dargenty",
+      "given_name": "G.",
+      "surname": "Dargenty",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
+}
diff --git a/python/tests/files/datacite/datacite_result_02.json b/python/tests/files/datacite/datacite_result_02.json
index bdcb4951..322baf59 100644
--- a/python/tests/files/datacite/datacite_result_02.json
+++ b/python/tests/files/datacite/datacite_result_02.json
@@ -1,36 +1,40 @@
 {
-    "extra": {
-        "datacite": {
-            "license": [
-                {
-                    "lang": "de",
-                    "rights": "Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen - https://creativecommons.org/licenses/by-sa/3.0/de/"
-                },
-                {
-                    "lang": "en",
-                    "rights": "Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen - https://creativecommons.org/licenses/by-sa/3.0/"
-                }
-            ]
-        }
-    },
-    "title": "Solinger Schwertschmiede-Familien, [4]",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_year": 1897,
-    "ext_ids": {
-        "doi": "10.11588/diglit.37715.57"
-    },
-    "publisher": "University Library Heidelberg",
-    "language": "de",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "license": [
+        {
+          "lang": "de",
+          "rights": "Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen - https://creativecommons.org/licenses/by-sa/3.0/de/"
+        },
         {
-            "index": 0,
-            "raw_name": "Albert Weyersberg",
-            "given_name": "Albert",
-            "surname": "Weyersberg",
-            "role": "author"
+          "lang": "en",
+          "rights": "Creative Commons - Namensnennung - Weitergabe unter gleichen Bedingungen - https://creativecommons.org/licenses/by-sa/3.0/"
         }
-    ],
-    "refs": [],
-    "abstracts": []
-}
\ No newline at end of file
+      ],
+      "metadataVersion": 2,
+      "resourceType": "DigitalisatDigital copy",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-4"
+    }
+  },
+  "title": "Solinger Schwertschmiede-Familien, [4]",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_year": 1897,
+  "ext_ids": {
+    "doi": "10.11588/diglit.37715.57"
+  },
+  "publisher": "University Library Heidelberg",
+  "language": "de",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Albert Weyersberg",
+      "given_name": "Albert",
+      "surname": "Weyersberg",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
+}
diff --git a/python/tests/files/datacite/datacite_result_03.json b/python/tests/files/datacite/datacite_result_03.json
index e8367e8f..41d8d4cd 100644
--- a/python/tests/files/datacite/datacite_result_03.json
+++ b/python/tests/files/datacite/datacite_result_03.json
@@ -1,19 +1,23 @@
 {
-    "extra": {"datacite": {}},
-    "title": "midterm ah30903",
-    "release_type": "article",
-    "release_year": 2016,
-    "ext_ids": {
-        "doi": "10.13140/rg.2.2.30434.53446"
-    },
-    "language": "ms",
-    "contribs": [
-        {
-            "index": 0,
-            "raw_name": "Mastura Yahya",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": []
+  "extra": {
+    "datacite": {
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    }
+  },
+  "title": "midterm ah30903",
+  "release_type": "article",
+  "release_year": 2016,
+  "ext_ids": {
+    "doi": "10.13140/rg.2.2.30434.53446"
+  },
+  "language": "ms",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Mastura Yahya",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_04.json b/python/tests/files/datacite/datacite_result_04.json
index 5b956836..0976e40e 100644
--- a/python/tests/files/datacite/datacite_result_04.json
+++ b/python/tests/files/datacite/datacite_result_04.json
@@ -1,29 +1,36 @@
 {
-    "extra": {"datacite": {}},
-    "title": "On chain maps inducing isomorphisms in homology",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_year": 1973,
-    "ext_ids": {
-        "doi": "10.14288/1.0080520"
-    },
-    "publisher": "University of British Columbia",
-    "language": "en",
-    "contribs": [
-        {
-            "index": 0,
-            "raw_name": "Marc Andre Nicollerat",
-            "given_name": "Marc Andre",
-            "surname": "Nicollerat",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": [
-        {
-            "content": "Let A be an abelian category, I the full subcategory of A consisting of injective objects of A, and K(A) the category whose objects are cochain complexes of elements of A, and whose morphisms are homotopy classes of cochain maps.  In (5), lemma 4.6., p. 42, R. Hartshorne has proved that, under certain conditions, a cochain complex X\u02d9 \u03b5. |KA)| can be embedded in a complex I\u02d9 \u03b5. |K(I)| in such a way that I\u02d9 has the same cohomology as X\u02d9.  In Chapter I we show that the construction given in the two first parts of Hartshorne's Lemma is natural i.e. there exists a functor  J : K(A) \u2192 K(I) and a natural transformation [formula omitted]  (where E : K(I) \u2192 K(A) is the embedding functor) such that [formula omitted] is  injective and induces isomorphism in cohomology. The question whether the construction given in the third part of the lemma is functorial is still open.  We also prove that J is left adjoint to E, so that K(I) is a reflective subcategory of K(A).  In the special case where A is a category [formula omitted] of left A-modules, and [formula omitted] the category of cochain complexes in [formula omitted] and cochain maps (not homotopy classes), we prove the existence of a functor [formula omitted]  In Chapter II we study the natural homomorphism [formula omitted]   where A, B are rings, and M, L, N modules or chain complexes. In particular we give several sufficient conditions under which v is an isomorphism, or induces isomorphism in homology.  In the appendix we give a detailed proof of Hartshorne's Lemma. We think that this is useful, as no complete proof is, to our knowledge, to be found in the literature.",
-            "mimetype": "text/plain",
-            "lang": "en"
-        }
-    ]
+  "extra": {
+    "datacite": {
+      "metadataVersion": 5,
+      "resourceType": "Text",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    }
+  },
+  "title": "On chain maps inducing isomorphisms in homology",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_year": 1973,
+  "ext_ids": {
+    "doi": "10.14288/1.0080520"
+  },
+  "publisher": "University of British Columbia",
+  "language": "en",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Marc Andre Nicollerat",
+      "given_name": "Marc Andre",
+      "surname": "Nicollerat",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [
+    {
+      "content": "Let A be an abelian category, I the full subcategory of A consisting of injective objects of A, and K(A) the category whose objects are cochain complexes of elements of A, and whose morphisms are homotopy classes of cochain maps.  In (5), lemma 4.6., p. 42, R. Hartshorne has proved that, under certain conditions, a cochain complex X˙ ε. |KA)| can be embedded in a complex I˙ ε. |K(I)| in such a way that I˙ has the same cohomology as X˙.  In Chapter I we show that the construction given in the two first parts of Hartshorne's Lemma is natural i.e. there exists a functor  J : K(A) → K(I) and a natural transformation [formula omitted]  (where E : K(I) → K(A) is the embedding functor) such that [formula omitted] is  injective and induces isomorphism in cohomology. The question whether the construction given in the third part of the lemma is functorial is still open.  We also prove that J is left adjoint to E, so that K(I) is a reflective subcategory of K(A).  In the special case where A is a category [formula omitted] of left A-modules, and [formula omitted] the category of cochain complexes in [formula omitted] and cochain maps (not homotopy classes), we prove the existence of a functor [formula omitted]  In Chapter II we study the natural homomorphism [formula omitted]   where A, B are rings, and M, L, N modules or chain complexes. In particular we give several sufficient conditions under which v is an isomorphism, or induces isomorphism in homology.  In the appendix we give a detailed proof of Hartshorne's Lemma. We think that this is useful, as no complete proof is, to our knowledge, to be found in the literature.",
+      "mimetype": "text/plain",
+      "lang": "en"
+    }
+  ]
 }
diff --git a/python/tests/files/datacite/datacite_result_05.json b/python/tests/files/datacite/datacite_result_05.json
index 1352fe29..961ad72a 100644
--- a/python/tests/files/datacite/datacite_result_05.json
+++ b/python/tests/files/datacite/datacite_result_05.json
@@ -1,532 +1,536 @@
 {
-    "extra": {
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-            "license": [
-                {
-                    "rights": "Attribution-NonCommercial (CC BY-NC)",
-                    "rightsUri": "http://creativecommons.org/licenses/by-nc/4.0"
-                }
-            ]
-        },
-        "month": 10
-    },
-    "title": "SH409843.07FU",
-    "subtitle": "Gomphales",
-    "release_type": "dataset",
-    "release_stage": "published",
-    "release_date": "2014-10-05",
-    "release_year": 2014,
-    "ext_ids": {
-        "doi": "10.15156/bio/sh409843.07fu"
-    },
-    "publisher": "UNITE Community",
-    "language": "en",
-    "license_slug": "CC-BY-NC",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "license": [
         {
-            "index": 0,
-            "raw_name": "Urmas K\u00f5ljalg",
-            "given_name": "Urmas",
-            "surname": "K\u00f5ljalg",
-            "role": "author"
-        },
-        {
-            "index": 1,
-            "raw_name": "Kessy Abarenkov",
-            "given_name": "Kessy",
-            "surname": "Abarenkov",
-            "role": "author"
-        },
-        {
-            "index": 2,
-            "raw_name": "R. Henrik Nilsson",
-            "given_name": "R. Henrik",
-            "surname": "Nilsson",
-            "role": "author"
-        },
-        {
-            "index": 3,
-            "raw_name": "Karl-Henrik Larsson",
-            "given_name": "Karl-Henrik",
-            "surname": "Larsson",
-            "role": "author"
-        },
-        {
-            "index": 4,
-            "raw_name": "Anders Bj\u00f8rnsgard Aas",
-            "given_name": "Anders Bj\u00f8rnsgard",
-            "surname": "Aas",
-            "role": "author"
-        },
-        {
-            "index": 5,
-            "raw_name": "Rachel Adams",
-            "given_name": "Rachel",
-            "surname": "Adams",
-            "role": "author"
-        },
-        {
-            "index": 6,
-            "raw_name": "Artur Alves",
-            "given_name": "Artur",
-            "surname": "Alves",
-            "role": "author"
-        },
-        {
-            "index": 7,
-            "raw_name": "Joseph F. Ammirati",
-            "given_name": "Joseph F.",
-            "surname": "Ammirati",
-            "role": "author"
-        },
-        {
-            "index": 8,
-            "raw_name": "A. Elizabeth Arnold",
-            "given_name": "A. Elizabeth",
-            "surname": "Arnold",
-            "role": "author"
-        },
-        {
-            "index": 9,
-            "raw_name": "Mohammad Bahram",
-            "given_name": "Mohammad",
-            "surname": "Bahram",
-            "role": "author"
-        },
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-            "raw_name": "Johan Bengtsson-Palme",
-            "given_name": "Johan",
-            "surname": "Bengtsson-Palme",
-            "role": "author"
-        },
-        {
-            "index": 11,
-            "raw_name": "Anna Berlin",
-            "given_name": "Anna",
-            "surname": "Berlin",
-            "role": "author"
-        },
-        {
-            "index": 12,
-            "raw_name": "Synn\u00f8ve Botnen",
-            "given_name": "Synn\u00f8ve",
-            "surname": "Botnen",
-            "role": "author"
-        },
-        {
-            "index": 13,
-            "raw_name": "Sarah Bourlat",
-            "given_name": "Sarah",
-            "surname": "Bourlat",
-            "role": "author"
-        },
-        {
-            "index": 14,
-            "raw_name": "Tanya Cheeke",
-            "given_name": "Tanya",
-            "surname": "Cheeke",
-            "role": "author"
-        },
-        {
-            "index": 15,
-            "raw_name": "B\u00e1lint Dima",
-            "given_name": "B\u00e1lint",
-            "surname": "Dima",
-            "role": "author"
-        },
-        {
-            "index": 16,
-            "raw_name": "Rein Drenkhan",
-            "given_name": "Rein",
-            "surname": "Drenkhan",
-            "role": "author"
-        },
-        {
-            "index": 17,
-            "raw_name": "Camila Duarte",
-            "given_name": "Camila",
-            "surname": "Duarte",
-            "role": "author"
-        },
-        {
-            "index": 18,
-            "raw_name": "Margarita Due\u00f1as",
-            "given_name": "Margarita",
-            "surname": "Due\u00f1as",
-            "role": "author"
-        },
-        {
-            "index": 19,
-            "raw_name": "Ursula Eberhardt",
-            "given_name": "Ursula",
-            "surname": "Eberhardt",
-            "role": "author"
-        },
-        {
-            "index": 20,
-            "raw_name": "Hanna Friberg",
-            "given_name": "Hanna",
-            "surname": "Friberg",
-            "role": "author"
-        },
-        {
-            "index": 21,
-            "raw_name": "Tobias G. Fr\u00f8slev",
-            "given_name": "Tobias G.",
-            "surname": "Fr\u00f8slev",
-            "role": "author"
-        },
-        {
-            "index": 22,
-            "raw_name": "Sigisfredo Garnica",
-            "given_name": "Sigisfredo",
-            "surname": "Garnica",
-            "role": "author"
-        },
-        {
-            "index": 23,
-            "raw_name": "J\u00f3zsef Geml",
-            "given_name": "J\u00f3zsef",
-            "surname": "Geml",
-            "role": "author"
-        },
-        {
-            "index": 24,
-            "raw_name": "Masoomeh Ghobad-Nejhad",
-            "given_name": "Masoomeh",
-            "surname": "Ghobad-Nejhad",
-            "role": "author"
-        },
-        {
-            "index": 25,
-            "raw_name": "Tine Grebenc",
-            "given_name": "Tine",
-            "surname": "Grebenc",
-            "role": "author"
-        },
-        {
-            "index": 26,
-            "raw_name": "Gareth W. Griffith",
-            "given_name": "Gareth W.",
-            "surname": "Griffith",
-            "role": "author"
-        },
-        {
-            "index": 27,
-            "raw_name": "Felix Hampe",
-            "given_name": "Felix",
-            "surname": "Hampe",
-            "role": "author"
-        },
-        {
-            "index": 28,
-            "raw_name": "Peter Kennedy",
-            "given_name": "Peter",
-            "surname": "Kennedy",
-            "role": "author"
-        },
-        {
-            "index": 29,
-            "raw_name": "Maryia Khomich",
-            "given_name": "Maryia",
-            "surname": "Khomich",
-            "role": "author"
-        },
-        {
-            "index": 30,
-            "raw_name": "Petr Kohout",
-            "given_name": "Petr",
-            "surname": "Kohout",
-            "role": "author"
-        },
-        {
-            "index": 31,
-            "raw_name": "Anu Kollom",
-            "given_name": "Anu",
-            "surname": "Kollom",
-            "role": "author"
-        },
-        {
-            "index": 32,
-            "raw_name": "Ellen Larsson",
-            "given_name": "Ellen",
-            "surname": "Larsson",
-            "role": "author"
-        },
-        {
-            "index": 33,
-            "raw_name": "Irinyi Laszlo",
-            "given_name": "Irinyi",
-            "surname": "Laszlo",
-            "role": "author"
-        },
-        {
-            "index": 34,
-            "raw_name": "Steven Leavitt",
-            "given_name": "Steven",
-            "surname": "Leavitt",
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-        },
-        {
-            "index": 35,
-            "raw_name": "Kare Liimatainen",
-            "given_name": "Kare",
-            "surname": "Liimatainen",
-            "role": "author"
-        },
-        {
-            "index": 36,
-            "raw_name": "Bj\u00f6rn Lindahl",
-            "given_name": "Bj\u00f6rn",
-            "surname": "Lindahl",
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-        },
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-            "raw_name": "Deborah J. Lodge",
-            "given_name": "Deborah J.",
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-            "raw_name": "Helge Thorsten Lumbsch",
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-            "role": "author"
-        },
-        {
-            "index": 39,
-            "raw_name": "Mar\u00eda Paz Mart\u00edn Esteban",
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-            "surname": "Mart\u00edn Esteban",
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-        },
-        {
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-            "raw_name": "Wieland Meyer",
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-        },
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-            "index": 41,
-            "raw_name": "Otto Miettinen",
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-            "surname": "Miettinen",
-            "role": "author"
-        },
-        {
-            "index": 42,
-            "raw_name": "Nhu Nguyen",
-            "given_name": "Nhu",
-            "surname": "Nguyen",
-            "role": "author"
-        },
-        {
-            "index": 43,
-            "raw_name": "Tuula Niskanen",
-            "given_name": "Tuula",
-            "surname": "Niskanen",
-            "role": "author"
-        },
-        {
-            "index": 44,
-            "raw_name": "Ryoko Oono",
-            "given_name": "Ryoko",
-            "surname": "Oono",
-            "role": "author"
-        },
-        {
-            "index": 45,
-            "raw_name": "Maarja \u00d6pik",
-            "given_name": "Maarja",
-            "surname": "\u00d6pik",
-            "role": "author"
-        },
-        {
-            "index": 46,
-            "raw_name": "Alexander Ordynets",
-            "given_name": "Alexander",
-            "surname": "Ordynets",
-            "role": "author"
-        },
-        {
-            "index": 47,
-            "raw_name": "Julia Paw\u0142owska",
-            "given_name": "Julia",
-            "surname": "Paw\u0142owska",
-            "role": "author"
-        },
-        {
-            "index": 48,
-            "raw_name": "Ursula Peintner",
-            "given_name": "Ursula",
-            "surname": "Peintner",
-            "role": "author"
-        },
-        {
-            "index": 49,
-            "raw_name": "Olinto Liparini Pereira",
-            "given_name": "Olinto Liparini",
-            "surname": "Pereira",
-            "role": "author"
-        },
-        {
-            "index": 50,
-            "raw_name": "Danilo Batista Pinho",
-            "given_name": "Danilo Batista",
-            "surname": "Pinho",
-            "role": "author"
-        },
-        {
-            "index": 51,
-            "raw_name": "Kadri P\u00f5ldmaa",
-            "given_name": "Kadri",
-            "surname": "P\u00f5ldmaa",
-            "role": "author"
-        },
-        {
-            "index": 52,
-            "raw_name": "Kadri Runnel",
-            "given_name": "Kadri",
-            "surname": "Runnel",
-            "role": "author"
-        },
-        {
-            "index": 53,
-            "raw_name": "Martin Ryberg",
-            "given_name": "Martin",
-            "surname": "Ryberg",
-            "role": "author"
-        },
-        {
-            "index": 54,
-            "raw_name": "Irja Saar",
-            "given_name": "Irja",
-            "surname": "Saar",
-            "role": "author"
-        },
-        {
-            "index": 55,
-            "raw_name": "Kemal Sanli",
-            "given_name": "Kemal",
-            "surname": "Sanli",
-            "role": "author"
-        },
-        {
-            "index": 56,
-            "raw_name": "James Scott",
-            "given_name": "James",
-            "surname": "Scott",
-            "role": "author"
-        },
-        {
-            "index": 57,
-            "raw_name": "Viacheslav Spirin",
-            "given_name": "Viacheslav",
-            "surname": "Spirin",
-            "role": "author"
-        },
-        {
-            "index": 58,
-            "raw_name": "Ave Suija",
-            "given_name": "Ave",
-            "surname": "Suija",
-            "role": "author"
-        },
-        {
-            "index": 59,
-            "raw_name": "Sten Svantesson",
-            "given_name": "Sten",
-            "surname": "Svantesson",
-            "role": "author"
-        },
-        {
-            "index": 60,
-            "raw_name": "Mariusz Tadych",
-            "given_name": "Mariusz",
-            "surname": "Tadych",
-            "role": "author"
-        },
-        {
-            "index": 61,
-            "raw_name": "Susumu Takamatsu",
-            "given_name": "Susumu",
-            "surname": "Takamatsu",
-            "role": "author"
-        },
-        {
-            "index": 62,
-            "raw_name": "Heidi Tamm",
-            "given_name": "Heidi",
-            "surname": "Tamm",
-            "role": "author"
-        },
-        {
-            "index": 63,
-            "raw_name": "AFS. Taylor",
-            "given_name": "AFS.",
-            "surname": "Taylor",
-            "role": "author"
-        },
-        {
-            "index": 64,
-            "raw_name": "Leho Tedersoo",
-            "given_name": "Leho",
-            "surname": "Tedersoo",
-            "role": "author"
-        },
-        {
-            "index": 65,
-            "raw_name": "M.T. Telleria",
-            "given_name": "M.T.",
-            "surname": "Telleria",
-            "role": "author"
-        },
-        {
-            "index": 66,
-            "raw_name": "Dhanushka Udayanga",
-            "given_name": "Dhanushka",
-            "surname": "Udayanga",
-            "role": "author"
-        },
-        {
-            "index": 67,
-            "raw_name": "Martin Unterseher",
-            "given_name": "Martin",
-            "surname": "Unterseher",
-            "role": "author"
-        },
-        {
-            "index": 68,
-            "raw_name": "Sergey Volobuev",
-            "given_name": "Sergey",
-            "surname": "Volobuev",
-            "role": "author"
-        },
-        {
-            "index": 69,
-            "raw_name": "Michael Weiss",
-            "given_name": "Michael",
-            "surname": "Weiss",
-            "role": "author"
-        },
-        {
-            "index": 70,
-            "raw_name": "Christian Wurzbacher",
-            "given_name": "Christian",
-            "surname": "Wurzbacher",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": [
-        {
-            "content": "UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.",
-            "mimetype": "text/plain",
-            "lang": "en"
+          "rights": "Attribution-NonCommercial (CC BY-NC)",
+          "rightsUri": "http://creativecommons.org/licenses/by-nc/4.0"
         }
-    ]
+      ],
+      "metadataVersion": 1,
+      "resourceType": "Dataset/UNITE Species Hypothesis",
+      "resourceTypeGeneral": "Dataset",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    },
+    "month": 10
+  },
+  "title": "SH409843.07FU",
+  "subtitle": "Gomphales",
+  "release_type": "dataset",
+  "release_stage": "published",
+  "release_date": "2014-10-05",
+  "release_year": 2014,
+  "ext_ids": {
+    "doi": "10.15156/bio/sh409843.07fu"
+  },
+  "publisher": "UNITE Community",
+  "language": "en",
+  "license_slug": "CC-BY-NC",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Urmas Kõljalg",
+      "given_name": "Urmas",
+      "surname": "Kõljalg",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "Kessy Abarenkov",
+      "given_name": "Kessy",
+      "surname": "Abarenkov",
+      "role": "author"
+    },
+    {
+      "index": 2,
+      "raw_name": "R. Henrik Nilsson",
+      "given_name": "R. Henrik",
+      "surname": "Nilsson",
+      "role": "author"
+    },
+    {
+      "index": 3,
+      "raw_name": "Karl-Henrik Larsson",
+      "given_name": "Karl-Henrik",
+      "surname": "Larsson",
+      "role": "author"
+    },
+    {
+      "index": 4,
+      "raw_name": "Anders Bjørnsgard Aas",
+      "given_name": "Anders Bjørnsgard",
+      "surname": "Aas",
+      "role": "author"
+    },
+    {
+      "index": 5,
+      "raw_name": "Rachel Adams",
+      "given_name": "Rachel",
+      "surname": "Adams",
+      "role": "author"
+    },
+    {
+      "index": 6,
+      "raw_name": "Artur Alves",
+      "given_name": "Artur",
+      "surname": "Alves",
+      "role": "author"
+    },
+    {
+      "index": 7,
+      "raw_name": "Joseph F. Ammirati",
+      "given_name": "Joseph F.",
+      "surname": "Ammirati",
+      "role": "author"
+    },
+    {
+      "index": 8,
+      "raw_name": "A. Elizabeth Arnold",
+      "given_name": "A. Elizabeth",
+      "surname": "Arnold",
+      "role": "author"
+    },
+    {
+      "index": 9,
+      "raw_name": "Mohammad Bahram",
+      "given_name": "Mohammad",
+      "surname": "Bahram",
+      "role": "author"
+    },
+    {
+      "index": 10,
+      "raw_name": "Johan Bengtsson-Palme",
+      "given_name": "Johan",
+      "surname": "Bengtsson-Palme",
+      "role": "author"
+    },
+    {
+      "index": 11,
+      "raw_name": "Anna Berlin",
+      "given_name": "Anna",
+      "surname": "Berlin",
+      "role": "author"
+    },
+    {
+      "index": 12,
+      "raw_name": "Synnøve Botnen",
+      "given_name": "Synnøve",
+      "surname": "Botnen",
+      "role": "author"
+    },
+    {
+      "index": 13,
+      "raw_name": "Sarah Bourlat",
+      "given_name": "Sarah",
+      "surname": "Bourlat",
+      "role": "author"
+    },
+    {
+      "index": 14,
+      "raw_name": "Tanya Cheeke",
+      "given_name": "Tanya",
+      "surname": "Cheeke",
+      "role": "author"
+    },
+    {
+      "index": 15,
+      "raw_name": "Bálint Dima",
+      "given_name": "Bálint",
+      "surname": "Dima",
+      "role": "author"
+    },
+    {
+      "index": 16,
+      "raw_name": "Rein Drenkhan",
+      "given_name": "Rein",
+      "surname": "Drenkhan",
+      "role": "author"
+    },
+    {
+      "index": 17,
+      "raw_name": "Camila Duarte",
+      "given_name": "Camila",
+      "surname": "Duarte",
+      "role": "author"
+    },
+    {
+      "index": 18,
+      "raw_name": "Margarita Dueñas",
+      "given_name": "Margarita",
+      "surname": "Dueñas",
+      "role": "author"
+    },
+    {
+      "index": 19,
+      "raw_name": "Ursula Eberhardt",
+      "given_name": "Ursula",
+      "surname": "Eberhardt",
+      "role": "author"
+    },
+    {
+      "index": 20,
+      "raw_name": "Hanna Friberg",
+      "given_name": "Hanna",
+      "surname": "Friberg",
+      "role": "author"
+    },
+    {
+      "index": 21,
+      "raw_name": "Tobias G. Frøslev",
+      "given_name": "Tobias G.",
+      "surname": "Frøslev",
+      "role": "author"
+    },
+    {
+      "index": 22,
+      "raw_name": "Sigisfredo Garnica",
+      "given_name": "Sigisfredo",
+      "surname": "Garnica",
+      "role": "author"
+    },
+    {
+      "index": 23,
+      "raw_name": "József Geml",
+      "given_name": "József",
+      "surname": "Geml",
+      "role": "author"
+    },
+    {
+      "index": 24,
+      "raw_name": "Masoomeh Ghobad-Nejhad",
+      "given_name": "Masoomeh",
+      "surname": "Ghobad-Nejhad",
+      "role": "author"
+    },
+    {
+      "index": 25,
+      "raw_name": "Tine Grebenc",
+      "given_name": "Tine",
+      "surname": "Grebenc",
+      "role": "author"
+    },
+    {
+      "index": 26,
+      "raw_name": "Gareth W. Griffith",
+      "given_name": "Gareth W.",
+      "surname": "Griffith",
+      "role": "author"
+    },
+    {
+      "index": 27,
+      "raw_name": "Felix Hampe",
+      "given_name": "Felix",
+      "surname": "Hampe",
+      "role": "author"
+    },
+    {
+      "index": 28,
+      "raw_name": "Peter Kennedy",
+      "given_name": "Peter",
+      "surname": "Kennedy",
+      "role": "author"
+    },
+    {
+      "index": 29,
+      "raw_name": "Maryia Khomich",
+      "given_name": "Maryia",
+      "surname": "Khomich",
+      "role": "author"
+    },
+    {
+      "index": 30,
+      "raw_name": "Petr Kohout",
+      "given_name": "Petr",
+      "surname": "Kohout",
+      "role": "author"
+    },
+    {
+      "index": 31,
+      "raw_name": "Anu Kollom",
+      "given_name": "Anu",
+      "surname": "Kollom",
+      "role": "author"
+    },
+    {
+      "index": 32,
+      "raw_name": "Ellen Larsson",
+      "given_name": "Ellen",
+      "surname": "Larsson",
+      "role": "author"
+    },
+    {
+      "index": 33,
+      "raw_name": "Irinyi Laszlo",
+      "given_name": "Irinyi",
+      "surname": "Laszlo",
+      "role": "author"
+    },
+    {
+      "index": 34,
+      "raw_name": "Steven Leavitt",
+      "given_name": "Steven",
+      "surname": "Leavitt",
+      "role": "author"
+    },
+    {
+      "index": 35,
+      "raw_name": "Kare Liimatainen",
+      "given_name": "Kare",
+      "surname": "Liimatainen",
+      "role": "author"
+    },
+    {
+      "index": 36,
+      "raw_name": "Björn Lindahl",
+      "given_name": "Björn",
+      "surname": "Lindahl",
+      "role": "author"
+    },
+    {
+      "index": 37,
+      "raw_name": "Deborah J. Lodge",
+      "given_name": "Deborah J.",
+      "surname": "Lodge",
+      "role": "author"
+    },
+    {
+      "index": 38,
+      "raw_name": "Helge Thorsten Lumbsch",
+      "given_name": "Helge Thorsten",
+      "surname": "Lumbsch",
+      "role": "author"
+    },
+    {
+      "index": 39,
+      "raw_name": "María Paz Martín Esteban",
+      "given_name": "María Paz",
+      "surname": "Martín Esteban",
+      "role": "author"
+    },
+    {
+      "index": 40,
+      "raw_name": "Wieland Meyer",
+      "given_name": "Wieland",
+      "surname": "Meyer",
+      "role": "author"
+    },
+    {
+      "index": 41,
+      "raw_name": "Otto Miettinen",
+      "given_name": "Otto",
+      "surname": "Miettinen",
+      "role": "author"
+    },
+    {
+      "index": 42,
+      "raw_name": "Nhu Nguyen",
+      "given_name": "Nhu",
+      "surname": "Nguyen",
+      "role": "author"
+    },
+    {
+      "index": 43,
+      "raw_name": "Tuula Niskanen",
+      "given_name": "Tuula",
+      "surname": "Niskanen",
+      "role": "author"
+    },
+    {
+      "index": 44,
+      "raw_name": "Ryoko Oono",
+      "given_name": "Ryoko",
+      "surname": "Oono",
+      "role": "author"
+    },
+    {
+      "index": 45,
+      "raw_name": "Maarja Öpik",
+      "given_name": "Maarja",
+      "surname": "Öpik",
+      "role": "author"
+    },
+    {
+      "index": 46,
+      "raw_name": "Alexander Ordynets",
+      "given_name": "Alexander",
+      "surname": "Ordynets",
+      "role": "author"
+    },
+    {
+      "index": 47,
+      "raw_name": "Julia Pawłowska",
+      "given_name": "Julia",
+      "surname": "Pawłowska",
+      "role": "author"
+    },
+    {
+      "index": 48,
+      "raw_name": "Ursula Peintner",
+      "given_name": "Ursula",
+      "surname": "Peintner",
+      "role": "author"
+    },
+    {
+      "index": 49,
+      "raw_name": "Olinto Liparini Pereira",
+      "given_name": "Olinto Liparini",
+      "surname": "Pereira",
+      "role": "author"
+    },
+    {
+      "index": 50,
+      "raw_name": "Danilo Batista Pinho",
+      "given_name": "Danilo Batista",
+      "surname": "Pinho",
+      "role": "author"
+    },
+    {
+      "index": 51,
+      "raw_name": "Kadri Põldmaa",
+      "given_name": "Kadri",
+      "surname": "Põldmaa",
+      "role": "author"
+    },
+    {
+      "index": 52,
+      "raw_name": "Kadri Runnel",
+      "given_name": "Kadri",
+      "surname": "Runnel",
+      "role": "author"
+    },
+    {
+      "index": 53,
+      "raw_name": "Martin Ryberg",
+      "given_name": "Martin",
+      "surname": "Ryberg",
+      "role": "author"
+    },
+    {
+      "index": 54,
+      "raw_name": "Irja Saar",
+      "given_name": "Irja",
+      "surname": "Saar",
+      "role": "author"
+    },
+    {
+      "index": 55,
+      "raw_name": "Kemal Sanli",
+      "given_name": "Kemal",
+      "surname": "Sanli",
+      "role": "author"
+    },
+    {
+      "index": 56,
+      "raw_name": "James Scott",
+      "given_name": "James",
+      "surname": "Scott",
+      "role": "author"
+    },
+    {
+      "index": 57,
+      "raw_name": "Viacheslav Spirin",
+      "given_name": "Viacheslav",
+      "surname": "Spirin",
+      "role": "author"
+    },
+    {
+      "index": 58,
+      "raw_name": "Ave Suija",
+      "given_name": "Ave",
+      "surname": "Suija",
+      "role": "author"
+    },
+    {
+      "index": 59,
+      "raw_name": "Sten Svantesson",
+      "given_name": "Sten",
+      "surname": "Svantesson",
+      "role": "author"
+    },
+    {
+      "index": 60,
+      "raw_name": "Mariusz Tadych",
+      "given_name": "Mariusz",
+      "surname": "Tadych",
+      "role": "author"
+    },
+    {
+      "index": 61,
+      "raw_name": "Susumu Takamatsu",
+      "given_name": "Susumu",
+      "surname": "Takamatsu",
+      "role": "author"
+    },
+    {
+      "index": 62,
+      "raw_name": "Heidi Tamm",
+      "given_name": "Heidi",
+      "surname": "Tamm",
+      "role": "author"
+    },
+    {
+      "index": 63,
+      "raw_name": "AFS. Taylor",
+      "given_name": "AFS.",
+      "surname": "Taylor",
+      "role": "author"
+    },
+    {
+      "index": 64,
+      "raw_name": "Leho Tedersoo",
+      "given_name": "Leho",
+      "surname": "Tedersoo",
+      "role": "author"
+    },
+    {
+      "index": 65,
+      "raw_name": "M.T. Telleria",
+      "given_name": "M.T.",
+      "surname": "Telleria",
+      "role": "author"
+    },
+    {
+      "index": 66,
+      "raw_name": "Dhanushka Udayanga",
+      "given_name": "Dhanushka",
+      "surname": "Udayanga",
+      "role": "author"
+    },
+    {
+      "index": 67,
+      "raw_name": "Martin Unterseher",
+      "given_name": "Martin",
+      "surname": "Unterseher",
+      "role": "author"
+    },
+    {
+      "index": 68,
+      "raw_name": "Sergey Volobuev",
+      "given_name": "Sergey",
+      "surname": "Volobuev",
+      "role": "author"
+    },
+    {
+      "index": 69,
+      "raw_name": "Michael Weiss",
+      "given_name": "Michael",
+      "surname": "Weiss",
+      "role": "author"
+    },
+    {
+      "index": 70,
+      "raw_name": "Christian Wurzbacher",
+      "given_name": "Christian",
+      "surname": "Wurzbacher",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [
+    {
+      "content": "UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.",
+      "mimetype": "text/plain",
+      "lang": "en"
+    }
+  ]
 }
diff --git a/python/tests/files/datacite/datacite_result_06.json b/python/tests/files/datacite/datacite_result_06.json
index 61f2549d..18880100 100644
--- a/python/tests/files/datacite/datacite_result_06.json
+++ b/python/tests/files/datacite/datacite_result_06.json
@@ -1,26 +1,29 @@
 {
-    "extra": {
-        "datacite": {
-            "license": [
-                {
-                    "rights": "ETH-Bibliothek Z\u00fcrich, Graphische Sammlung / D 6220 / Public Domain Mark 1.0"
-                }
-            ]
-        }
-    },
-    "title": "Der Eifer (Sedulitas), Blatt 7 der Folge \"Die Tugenden\"",
-    "release_type": "article",
-    "release_year": 1590,
-    "ext_ids": {
-        "doi": "10.16903/ethz-grs-d_006220"
-    },
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "license": [
         {
-            "index": 0,
-            "raw_name": "Crispijn De Passe (Der \u00c4ltere) (1564-1637)",
-            "role": "author"
+          "rights": "ETH-Bibliothek Zürich, Graphische Sammlung / D 6220 / Public Domain Mark 1.0"
         }
-    ],
-    "refs": [],
-    "abstracts": []
-}
\ No newline at end of file
+      ],
+      "metadataVersion": 1,
+      "resourceTypeGeneral": "InteractiveResource",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    }
+  },
+  "title": "Der Eifer (Sedulitas), Blatt 7 der Folge \"Die Tugenden\"",
+  "release_type": "article",
+  "release_year": 1590,
+  "ext_ids": {
+    "doi": "10.16903/ethz-grs-d_006220"
+  },
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Crispijn De Passe (Der Ältere) (1564-1637)",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
+}
diff --git a/python/tests/files/datacite/datacite_result_07.json b/python/tests/files/datacite/datacite_result_07.json
index f694ddef..23b63d50 100644
--- a/python/tests/files/datacite/datacite_result_07.json
+++ b/python/tests/files/datacite/datacite_result_07.json
@@ -1,74 +1,76 @@
 {
-    "extra": {
-        "datacite": {
-            "subjects": [
-                {
-                    "subject": "HEAT PUMP"
-                },
-                {
-                    "subject": "HOT WATER"
-                },
-                {
-                    "subject": "HEAT TRANSFER"
-                },
-                {
-                    "subject": "PERFORMANCE"
-                },
-                {
-                    "subject": "THERMAL STORAGE"
-                },
-                {
-                    "subject": "TANK"
-                },
-                {
-                    "subject": "MODEL"
-                }
-            ]
-        }
-    },
-    "title": "High efficient heat pump system using storage tanks to increase cop by means of the ISEC concept. 1: model validation.",
-    "release_type": "dataset",
-    "release_stage": "published",
-    "release_year": 2015,
-    "ext_ids": {
-        "doi": "10.18462/iir.icr.2015.0926"
-    },
-    "publisher": "International Institute of Refrigeration (IIR)",
-    "language": "en",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "subjects": [
         {
-            "index": 0,
-            "raw_name": "E. ROTHUIZEN",
-            "given_name": "E.",
-            "surname": "ROTHUIZEN",
-            "role": "author"
+          "subject": "HEAT PUMP"
         },
         {
-            "index": 1,
-            "raw_name": "B. ELMEGAARD",
-            "given_name": "B.",
-            "surname": "ELMEGAARD",
-            "role": "author"
+          "subject": "HOT WATER"
         },
         {
-            "index": 2,
-            "raw_name": "B. MARKUSSEN W.",
-            "given_name": "B.",
-            "surname": "MARKUSSEN W.",
-            "role": "author"
+          "subject": "HEAT TRANSFER"
         },
         {
-            "index": 3,
-            "raw_name": "Et Al.",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": [
+          "subject": "PERFORMANCE"
+        },
+        {
+          "subject": "THERMAL STORAGE"
+        },
+        {
+          "subject": "TANK"
+        },
         {
-            "content": "The purpose of the ISEC concept is to provide a high-efficient heat pump system for hot water production. The ISEC concept uses two storage tanks for the water, one discharged and one charged. Hot water for the industrial process is tapped from the charged tank, while the other tank is charging. Charging is done by circulating the water in the tank through the condenser of a heat pump several times and thereby gradually heating the water. The charging is done with a higher mass flow rate than the discharging to reach several circulations of the water during the time frame of one discharging. This result in a lower condensing temperature than if the water was heated in one step. Two test setups were built, one to test the performance of the heat pump gradually heating the water and one to investigate the stratification in the storage tanks. Furthermore, a dynamic model of the system was implemented in Dymola, and validated by the use of test data from the two experimental setups. This paper shows that there is a good consistency between the model and the experimental tests.",
-            "mimetype": "text/plain",
-            "lang": "en"
+          "subject": "MODEL"
         }
-    ]
+      ],
+      "resourceType": "Dataset",
+      "resourceTypeGeneral": "Dataset"
+    }
+  },
+  "title": "High efficient heat pump system using storage tanks to increase cop by means of the ISEC concept. 1: model validation.",
+  "release_type": "dataset",
+  "release_stage": "published",
+  "release_year": 2015,
+  "ext_ids": {
+    "doi": "10.18462/iir.icr.2015.0926"
+  },
+  "publisher": "International Institute of Refrigeration (IIR)",
+  "language": "en",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "E. ROTHUIZEN",
+      "given_name": "E.",
+      "surname": "ROTHUIZEN",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "B. ELMEGAARD",
+      "given_name": "B.",
+      "surname": "ELMEGAARD",
+      "role": "author"
+    },
+    {
+      "index": 2,
+      "raw_name": "B. MARKUSSEN W.",
+      "given_name": "B.",
+      "surname": "MARKUSSEN W.",
+      "role": "author"
+    },
+    {
+      "index": 3,
+      "raw_name": "Et Al.",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [
+    {
+      "content": "The purpose of the ISEC concept is to provide a high-efficient heat pump system for hot water production. The ISEC concept uses two storage tanks for the water, one discharged and one charged. Hot water for the industrial process is tapped from the charged tank, while the other tank is charging. Charging is done by circulating the water in the tank through the condenser of a heat pump several times and thereby gradually heating the water. The charging is done with a higher mass flow rate than the discharging to reach several circulations of the water during the time frame of one discharging. This result in a lower condensing temperature than if the water was heated in one step. Two test setups were built, one to test the performance of the heat pump gradually heating the water and one to investigate the stratification in the storage tanks. Furthermore, a dynamic model of the system was implemented in Dymola, and validated by the use of test data from the two experimental setups. This paper shows that there is a good consistency between the model and the experimental tests.",
+      "mimetype": "text/plain",
+      "lang": "en"
+    }
+  ]
 }
diff --git a/python/tests/files/datacite/datacite_result_08.json b/python/tests/files/datacite/datacite_result_08.json
index 46ef5b44..ff942d0a 100644
--- a/python/tests/files/datacite/datacite_result_08.json
+++ b/python/tests/files/datacite/datacite_result_08.json
@@ -1,54 +1,57 @@
 {
-    "extra": {
-        "datacite": {
-            "subjects": [
-                {
-                    "subject": "Land Economics/Use"
-                },
-                {
-                    "subject": "irrigation",
-                    "subjectScheme": "keyword"
-                },
-                {
-                    "subject": "industrialization",
-                    "subjectScheme": "keyword"
-                },
-                {
-                    "subject": "collective action",
-                    "subjectScheme": "keyword"
-                }
-            ]
-        }
-    },
-    "title": "Irrigation Policies under Rapid Industrialization and Labor Migration: Lessons from Japan, China and India",
-    "release_type": "article-journal",
-    "release_year": 2017,
-    "ext_ids": {
-        "doi": "10.22004/ag.econ.284864"
-    },
-    "language": "en",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "subjects": [
         {
-            "index": 0,
-            "raw_name": "Kei Kajisa",
-            "given_name": "Kei",
-            "surname": "Kajisa",
-            "role": "author"
+          "subject": "Land Economics/Use"
         },
         {
-            "index": 1,
-            "raw_name": "Kei Kajisa",
-            "given_name": "Kei",
-            "surname": "Kajisa",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": [
+          "subject": "irrigation",
+          "subjectScheme": "keyword"
+        },
+        {
+          "subject": "industrialization",
+          "subjectScheme": "keyword"
+        },
         {
-            "content": "International society recognizes that the scarcity of fresh water is increasing and farming sectors suffer from lack of irrigation water. However, if we look at this issue with a framework of relative factor endowment, a different view will arise. In emerging states with rapid industrialization and labor migration, labor scarcity increases at a faster pace than that of irrigation water. Using the historical review of Japan's irrigation policies as well as the case studies of India and China, this paper shows that the introduction of policies which do not reflect the actual relative resource scarcity may mislead the development path. We argue that under increasing relative labor scarcity it is important to realize the substitution of capital for labor for surface irrigation system management and that the substitution needs public support because the service of surface irrigation system has some externalities. Through this argument, this paper also intends to shed the light back to the role of the state for local resource management which seems to be unfairly undervalued since the boom of community participatory approach in the 1980s.",
-            "mimetype": "text/plain",
-            "lang": "en"
+          "subject": "collective action",
+          "subjectScheme": "keyword"
         }
-    ]
+      ],
+      "metadataVersion": 1,
+      "resourceType": "Text",
+      "resourceTypeGeneral": "Text"
+    }
+  },
+  "title": "Irrigation Policies under Rapid Industrialization and Labor Migration: Lessons from Japan, China and India",
+  "release_type": "article-journal",
+  "release_year": 2017,
+  "ext_ids": {
+    "doi": "10.22004/ag.econ.284864"
+  },
+  "language": "en",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Kei Kajisa",
+      "given_name": "Kei",
+      "surname": "Kajisa",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "Kei Kajisa",
+      "given_name": "Kei",
+      "surname": "Kajisa",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [
+    {
+      "content": "International society recognizes that the scarcity of fresh water is increasing and farming sectors suffer from lack of irrigation water. However, if we look at this issue with a framework of relative factor endowment, a different view will arise. In emerging states with rapid industrialization and labor migration, labor scarcity increases at a faster pace than that of irrigation water. Using the historical review of Japan's irrigation policies as well as the case studies of India and China, this paper shows that the introduction of policies which do not reflect the actual relative resource scarcity may mislead the development path. We argue that under increasing relative labor scarcity it is important to realize the substitution of capital for labor for surface irrigation system management and that the substitution needs public support because the service of surface irrigation system has some externalities. Through this argument, this paper also intends to shed the light back to the role of the state for local resource management which seems to be unfairly undervalued since the boom of community participatory approach in the 1980s.",
+      "mimetype": "text/plain",
+      "lang": "en"
+    }
+  ]
 }
diff --git a/python/tests/files/datacite/datacite_result_09.json b/python/tests/files/datacite/datacite_result_09.json
index db103d2b..fd873309 100644
--- a/python/tests/files/datacite/datacite_result_09.json
+++ b/python/tests/files/datacite/datacite_result_09.json
@@ -1,35 +1,40 @@
 {
-    "extra": {
-        "datacite": {
-            "subjects": [
-                {
-                    "subject": "Direktdiodenlasersysteme"
-                },
-                {
-                    "subject": "Physics",
-                    "subjectScheme": "linsearch"
-                }
-            ]
-        }
-    },
-    "title": "BrightLas : TP3.3. Module f\u00fcr Direktdiodenstrahlquellen bis 4kW und Untersuchungen zur Leistungsskalierung (Diodemodul) : zum Verbundvorhaben Direktdiodenlaseranlagen und -systeme (VP3) im F\u00f6rderschwerpunkt innovative regionale Wachstumskerne, BMBF : Abschlussbericht",
-    "release_type": "report",
-    "release_stage": "published",
-    "release_year": 2016,
-    "ext_ids": {
-        "doi": "10.2314/gbv:880813733"
-    },
-    "publisher": "[Lumics GmbH]",
-    "language": "de",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "subjects": [
+        {
+          "subject": "Direktdiodenlasersysteme"
+        },
         {
-            "index": 0,
-            "raw_name": "Nils Kirstaedter",
-            "given_name": "Nils",
-            "surname": "Kirstaedter",
-            "role": "author"
+          "subject": "Physics",
+          "subjectScheme": "linsearch"
         }
-    ],
-    "refs": [],
-    "abstracts": []
-}
\ No newline at end of file
+      ],
+      "metadataVersion": 9,
+      "resourceType": "Report",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-4"
+    }
+  },
+  "title": "BrightLas : TP3.3. Module für Direktdiodenstrahlquellen bis 4kW und Untersuchungen zur Leistungsskalierung (Diodemodul) : zum Verbundvorhaben Direktdiodenlaseranlagen und -systeme (VP3) im Förderschwerpunkt innovative regionale Wachstumskerne, BMBF : Abschlussbericht",
+  "release_type": "report",
+  "release_stage": "published",
+  "release_year": 2016,
+  "ext_ids": {
+    "doi": "10.2314/gbv:880813733"
+  },
+  "publisher": "[Lumics GmbH]",
+  "language": "de",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Nils Kirstaedter",
+      "given_name": "Nils",
+      "surname": "Kirstaedter",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [],
+  "version": "1.0"
+}
diff --git a/python/tests/files/datacite/datacite_result_10.json b/python/tests/files/datacite/datacite_result_10.json
index 325facf7..8dea8957 100644
--- a/python/tests/files/datacite/datacite_result_10.json
+++ b/python/tests/files/datacite/datacite_result_10.json
@@ -1,32 +1,35 @@
 {
-    "extra": {
-        "datacite": {
-            "subjects": [
-                {
-                    "subject": "housing areas"
-                },
-                {
-                    "subject": "Dwellings"
-                }
-            ]
-        }
-    },
-    "title": "WPA household census for 210 E VERNON, Los Angeles",
-    "release_type": "dataset",
-    "release_stage": "published",
-    "release_year": 2012,
-    "ext_ids": {
-        "doi": "10.25549/wpacards-m6171"
-    },
-    "publisher": "University of Southern California Digital Library (USC.DL)",
-    "language": "en",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "subjects": [
+        {
+          "subject": "housing areas"
+        },
         {
-            "index": 0,
-            "raw_name": "Unknown",
-            "role": "author"
+          "subject": "Dwellings"
         }
-    ],
-    "refs": [],
-    "abstracts": []
-}
\ No newline at end of file
+      ],
+      "resourceType": "Dataset",
+      "resourceTypeGeneral": "Dataset",
+      "schemaVersion": "http://datacite.org/schema/kernel-4"
+    }
+  },
+  "title": "WPA household census for 210 E VERNON, Los Angeles",
+  "release_type": "dataset",
+  "release_stage": "published",
+  "release_year": 2012,
+  "ext_ids": {
+    "doi": "10.25549/wpacards-m6171"
+  },
+  "publisher": "University of Southern California Digital Library (USC.DL)",
+  "language": "en",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Unknown",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
+}
diff --git a/python/tests/files/datacite/datacite_result_11.json b/python/tests/files/datacite/datacite_result_11.json
index 3045701f..944ca718 100644
--- a/python/tests/files/datacite/datacite_result_11.json
+++ b/python/tests/files/datacite/datacite_result_11.json
@@ -1,21 +1,27 @@
 {
-    "extra": {"datacite": {}},
-    "title": "N1 bei Safenwil",
-    "release_type": "graphic",
-    "release_stage": "published",
-    "release_year": 1965,
-    "ext_ids": {
-        "doi": "10.3932/ethz-a-000055869"
-    },
-    "publisher": "ETH-Bibliothek Z\u00fcrich, Bildarchiv",
-    "language": "de",
-    "contribs": [
-        {
-            "index": 0,
-            "raw_name": "Comet Photo AG (Z\u00fcrich)",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": []
+  "extra": {
+    "datacite": {
+      "metadataVersion": 6,
+      "resourceTypeGeneral": "Image",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    }
+  },
+  "title": "N1 bei Safenwil",
+  "release_type": "graphic",
+  "release_stage": "published",
+  "release_year": 1965,
+  "ext_ids": {
+    "doi": "10.3932/ethz-a-000055869"
+  },
+  "publisher": "ETH-Bibliothek Zürich, Bildarchiv",
+  "language": "de",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Comet Photo AG (Zürich)",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_12.json b/python/tests/files/datacite/datacite_result_12.json
index c3a9071c..5e2a6281 100644
--- a/python/tests/files/datacite/datacite_result_12.json
+++ b/python/tests/files/datacite/datacite_result_12.json
@@ -1,44 +1,49 @@
 {
-    "extra": {"datacite": {}, "month": 6},
-    "title": "Anthropometric and Physiological Profile of Mixed Martial Art Athletes: A Brief Review",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_date": "2019-06-14",
-    "release_year": 2019,
-    "ext_ids": {
-        "doi": "10.5167/uzh-171449"
+  "extra": {
+    "datacite": {
+      "resourceTypeGeneral": "Text"
     },
-    "publisher": "MDPI Publishing",
-    "contribs": [
-        {
-            "index": 0,
-            "raw_name": "Charalampos Spanias",
-            "given_name": "Charalampos",
-            "surname": "Spanias",
-            "role": "author"
-        },
-        {
-            "index": 1,
-            "raw_name": "Pantelis T Nikolaidis",
-            "given_name": "Pantelis T",
-            "surname": "Nikolaidis",
-            "role": "author"
-        },
-        {
-            "index": 2,
-            "raw_name": "Thomas Rosemann",
-            "given_name": "Thomas",
-            "surname": "Rosemann",
-            "role": "author"
-        },
-        {
-            "index": 3,
-            "raw_name": "Beat Knechtle",
-            "given_name": "Beat",
-            "surname": "Knechtle",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": []
+    "month": 6
+  },
+  "title": "Anthropometric and Physiological Profile of Mixed Martial Art Athletes: A Brief Review",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_date": "2019-06-14",
+  "release_year": 2019,
+  "ext_ids": {
+    "doi": "10.5167/uzh-171449"
+  },
+  "publisher": "MDPI Publishing",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "Charalampos Spanias",
+      "given_name": "Charalampos",
+      "surname": "Spanias",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "Pantelis T Nikolaidis",
+      "given_name": "Pantelis T",
+      "surname": "Nikolaidis",
+      "role": "author"
+    },
+    {
+      "index": 2,
+      "raw_name": "Thomas Rosemann",
+      "given_name": "Thomas",
+      "surname": "Rosemann",
+      "role": "author"
+    },
+    {
+      "index": 3,
+      "raw_name": "Beat Knechtle",
+      "given_name": "Beat",
+      "surname": "Knechtle",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_13.json b/python/tests/files/datacite/datacite_result_13.json
index d6ed2985..3dc7cafb 100644
--- a/python/tests/files/datacite/datacite_result_13.json
+++ b/python/tests/files/datacite/datacite_result_13.json
@@ -1,28 +1,36 @@
 {
-    "extra": {"datacite": {}, "month": 10},
-    "title": "[M\u00fcssen wir des Gl\u00fccks uns sch\u00e4men?]",
-    "release_type": "article-journal",
-    "release_stage": "published",
-    "release_date": "1940-10-05",
-    "release_year": 1940,
-    "ext_ids": {
-        "doi": "10.5169/seals-314104"
+  "extra": {
+    "datacite": {
+      "metadataVersion": 17,
+      "resourceType": "Journal Article",
+      "resourceTypeGeneral": "Text",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
     },
-    "publisher": "Buchdruckerei B\u00fcchler & Co.",
-    "contribs": [
-        {
-            "index": 0,
-            "raw_name": "O.M.",
-            "role": "author"
-        },
-        {
-            "index": 1,
-            "raw_name": "Hermann Hiltbrunner",
-            "given_name": "Hermann",
-            "surname": "Hiltbrunner",
-            "role": "author"
-        }
-    ],
-    "refs": [],
-    "abstracts": []
+    "month": 10
+  },
+  "title": "[Müssen wir des Glücks uns schämen?]",
+  "release_type": "article-journal",
+  "release_stage": "published",
+  "release_date": "1940-10-05",
+  "release_year": 1940,
+  "ext_ids": {
+    "doi": "10.5169/seals-314104"
+  },
+  "publisher": "Buchdruckerei Büchler & Co.",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "O.M.",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "Hermann Hiltbrunner",
+      "given_name": "Hermann",
+      "surname": "Hiltbrunner",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_14.json b/python/tests/files/datacite/datacite_result_14.json
index c3719aeb..e28ee5c3 100644
--- a/python/tests/files/datacite/datacite_result_14.json
+++ b/python/tests/files/datacite/datacite_result_14.json
@@ -1,111 +1,114 @@
 {
-    "extra": {
-        "datacite": {
-            "subjects": [
-                {
-                    "subject": "Crystal Structure"
-                },
-                {
-                    "subject": "Experimental 3D Coordinates"
-                },
-                {
-                    "subject": "Crystal System"
-                },
-                {
-                    "subject": "Space Group"
-                },
-                {
-                    "subject": "Cell Parameters"
-                },
-                {
-                    "subject": "Crystallography"
-                },
-                {
-                    "subject": "bis(mu~2~-5-(3,5-Di-t-butylphenyl)-15-(4-(2-(diphenylphosphino)ethynyl)phenyl)-2,8,12,18-tetrahexyl-3,7,13,17-tetramethylporphyrinato)-(5,15-bis(3,5-di-t-butylphenyl)-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphyrinato)-di-nickel-ruthenium chloroform solvate"
-                }
-            ],
-            "relations": [
-                {
-                    "relationType": "IsSupplementTo",
-                    "relatedIdentifier": "10.1021/ic034699w",
-                    "relatedIdentifierType": "DOI"
-                }
-            ]
-        }
-    },
-    "title": "CCDC 222635: Experimental Crystal Structure Determination",
-    "release_type": "dataset",
-    "release_stage": "published",
-    "release_year": 2004,
-    "ext_ids": {
-        "doi": "10.5517/cc7gns3"
-    },
-    "publisher": "Cambridge Crystallographic Data Centre",
-    "language": "en",
-    "contribs": [
+  "extra": {
+    "datacite": {
+      "subjects": [
         {
-            "index": 0,
-            "raw_name": "E. Stulz",
-            "given_name": "E.",
-            "surname": "Stulz",
-            "role": "author"
+          "subject": "Crystal Structure"
         },
         {
-            "index": 1,
-            "raw_name": "S.M. Scott",
-            "given_name": "S.M.",
-            "surname": "Scott",
-            "role": "author"
+          "subject": "Experimental 3D Coordinates"
         },
         {
-            "index": 2,
-            "raw_name": "Yiu-Fai Ng",
-            "given_name": "Yiu-Fai",
-            "surname": "Ng",
-            "role": "author"
+          "subject": "Crystal System"
         },
         {
-            "index": 3,
-            "raw_name": "A.D. Bond",
-            "given_name": "A.D.",
-            "surname": "Bond",
-            "role": "author"
+          "subject": "Space Group"
         },
         {
-            "index": 4,
-            "raw_name": "S.J. Teat",
-            "given_name": "S.J.",
-            "surname": "Teat",
-            "role": "author"
+          "subject": "Cell Parameters"
         },
         {
-            "index": 5,
-            "raw_name": "S.L. Darling",
-            "given_name": "S.L.",
-            "surname": "Darling",
-            "role": "author"
+          "subject": "Crystallography"
         },
         {
-            "index": 6,
-            "raw_name": "N. Feeder",
-            "given_name": "N.",
-            "surname": "Feeder",
-            "role": "author"
-        },
-        {
-            "index": 7,
-            "raw_name": "J.K.M. Sanders",
-            "given_name": "J.K.M.",
-            "surname": "Sanders",
-            "role": "author"
+          "subject": "bis(mu~2~-5-(3,5-Di-t-butylphenyl)-15-(4-(2-(diphenylphosphino)ethynyl)phenyl)-2,8,12,18-tetrahexyl-3,7,13,17-tetramethylporphyrinato)-(5,15-bis(3,5-di-t-butylphenyl)-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphyrinato)-di-nickel-ruthenium chloroform solvate"
         }
-    ],
-    "refs": [],
-    "abstracts": [
+      ],
+      "relations": [
         {
-            "content": "An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.",
-            "mimetype": "text/plain",
-            "lang": "en"
+          "relationType": "IsSupplementTo",
+          "relatedIdentifier": "10.1021/ic034699w",
+          "relatedIdentifierType": "DOI"
         }
-    ]
+      ],
+      "metadataVersion": 2,
+      "resourceTypeGeneral": "Dataset",
+      "schemaVersion": "http://datacite.org/schema/kernel-3"
+    }
+  },
+  "title": "CCDC 222635: Experimental Crystal Structure Determination",
+  "release_type": "dataset",
+  "release_stage": "published",
+  "release_year": 2004,
+  "ext_ids": {
+    "doi": "10.5517/cc7gns3"
+  },
+  "publisher": "Cambridge Crystallographic Data Centre",
+  "language": "en",
+  "contribs": [
+    {
+      "index": 0,
+      "raw_name": "E. Stulz",
+      "given_name": "E.",
+      "surname": "Stulz",
+      "role": "author"
+    },
+    {
+      "index": 1,
+      "raw_name": "S.M. Scott",
+      "given_name": "S.M.",
+      "surname": "Scott",
+      "role": "author"
+    },
+    {
+      "index": 2,
+      "raw_name": "Yiu-Fai Ng",
+      "given_name": "Yiu-Fai",
+      "surname": "Ng",
+      "role": "author"
+    },
+    {
+      "index": 3,
+      "raw_name": "A.D. Bond",
+      "given_name": "A.D.",
+      "surname": "Bond",
+      "role": "author"
+    },
+    {
+      "index": 4,
+      "raw_name": "S.J. Teat",
+      "given_name": "S.J.",
+      "surname": "Teat",
+      "role": "author"
+    },
+    {
+      "index": 5,
+      "raw_name": "S.L. Darling",
+      "given_name": "S.L.",
+      "surname": "Darling",
+      "role": "author"
+    },
+    {
+      "index": 6,
+      "raw_name": "N. Feeder",
+      "given_name": "N.",
+      "surname": "Feeder",
+      "role": "author"
+    },
+    {
+      "index": 7,
+      "raw_name": "J.K.M. Sanders",
+      "given_name": "J.K.M.",
+      "surname": "Sanders",
+      "role": "author"
+    }
+  ],
+  "refs": [],
+  "abstracts": [
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+  ]
 }
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index 1b430a7d..3a03dfb6 100644
--- a/python/tests/files/datacite/datacite_result_15.json
+++ b/python/tests/files/datacite/datacite_result_15.json
@@ -1,22 +1,29 @@
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 }
diff --git a/python/tests/files/datacite/datacite_result_16.json b/python/tests/files/datacite/datacite_result_16.json
index ea8c2e59..8cf762b6 100644
--- a/python/tests/files/datacite/datacite_result_16.json
+++ b/python/tests/files/datacite/datacite_result_16.json
@@ -1,31 +1,34 @@
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+          "rights": "CC-BY",
+          "rightsUri": "http://creativecommons.org/licenses/by/3.0/us"
         }
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-}
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+    }
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+  "abstracts": []
+}
diff --git a/python/tests/files/datacite/datacite_result_17.json b/python/tests/files/datacite/datacite_result_17.json
index 73b082d9..6e8c4e34 100644
--- a/python/tests/files/datacite/datacite_result_17.json
+++ b/python/tests/files/datacite/datacite_result_17.json
@@ -1,20 +1,25 @@
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-            "raw_name": "Di Giovanna, Antonino Paolo (University Of Florence)",
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+  "release_type": "dataset",
+  "release_stage": "published",
+  "release_year": 2018,
+  "ext_ids": {
+    "doi": "10.7910/dvn/tsqfwc/yytj22"
+  },
+  "publisher": "Harvard Dataverse",
+  "contribs": [
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+      "raw_name": "Di Giovanna, Antonino Paolo (University Of Florence)",
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+    }
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 }
diff --git a/python/tests/files/datacite/datacite_result_18.json b/python/tests/files/datacite/datacite_result_18.json
index fb109de2..43b46923 100644
--- a/python/tests/files/datacite/datacite_result_18.json
+++ b/python/tests/files/datacite/datacite_result_18.json
@@ -1,15 +1,21 @@
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-    "release_year": 2017,
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-    "contribs": [],
-    "refs": [],
-    "abstracts": []
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+  "release_stage": "published",
+  "release_date": "2017-08-21",
+  "release_year": 2017,
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+  "refs": [],
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 }
diff --git a/python/tests/files/datacite/datacite_result_19.json b/python/tests/files/datacite/datacite_result_19.json
index 85bada92..8b91efe5 100644
--- a/python/tests/files/datacite/datacite_result_19.json
+++ b/python/tests/files/datacite/datacite_result_19.json
@@ -1,15 +1,21 @@
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-    "release_year": 2017,
-    "ext_ids": {
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     },
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-    "contribs": [],
-    "refs": [],
-    "abstracts": []
+    "month": 8
+  },
+  "title": "Eastern questionnaire, answer sheet for Interviewee 55236, page 092",
+  "release_type": "article",
+  "release_stage": "published",
+  "release_date": "2017-08-24",
+  "release_year": 2017,
+  "ext_ids": {
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+  },
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+  "refs": [],
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diff --git a/python/tests/files/datacite/datacite_result_20.json b/python/tests/files/datacite/datacite_result_20.json
index 891cb41e..ed1f8885 100644
--- a/python/tests/files/datacite/datacite_result_20.json
+++ b/python/tests/files/datacite/datacite_result_20.json
@@ -1,14 +1,17 @@
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-    "contribs": [],
-    "refs": [],
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+  "extra": {
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diff --git a/python/tests/files/datacite/datacite_result_21.json b/python/tests/files/datacite/datacite_result_21.json
index 73df8216..1230abfa 100644
--- a/python/tests/files/datacite/datacite_result_21.json
+++ b/python/tests/files/datacite/datacite_result_21.json
@@ -1,15 +1,18 @@
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-        "doi": "10.7916/d86x0cg1"
-    },
-    "language": "de",
-    "contribs": [],
-    "refs": [],
-    "abstracts": []
+  "extra": {
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diff --git a/python/tests/files/datacite/datacite_result_22.json b/python/tests/files/datacite/datacite_result_22.json
index 97f35da5..cba01531 100644
--- a/python/tests/files/datacite/datacite_result_22.json
+++ b/python/tests/files/datacite/datacite_result_22.json
@@ -1,22 +1,25 @@
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-            "role": "author",
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-    "refs": [],
-    "abstracts": []
+  "extra": {
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+  },
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+  "release_type": "article",
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+  "release_date": "2017-08-24",
+  "release_year": 2017,
+  "ext_ids": {
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diff --git a/python/tests/files/datacite/datacite_result_23.json b/python/tests/files/datacite/datacite_result_23.json
index 93385c70..db622e1c 100644
--- a/python/tests/files/datacite/datacite_result_23.json
+++ b/python/tests/files/datacite/datacite_result_23.json
@@ -1,22 +1,25 @@
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-            "role": "author",
-            "raw_affiliation": "Department of pataphysics"
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-    "refs": [],
-    "abstracts": []
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+      "role": "author",
+      "raw_affiliation": "Department of pataphysics"
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+  ],
+  "refs": [],
+  "abstracts": []
 }
diff --git a/python/tests/files/datacite/datacite_result_24.json b/python/tests/files/datacite/datacite_result_24.json
index cb08e67b..8338cf29 100644
--- a/python/tests/files/datacite/datacite_result_24.json
+++ b/python/tests/files/datacite/datacite_result_24.json
@@ -1,22 +1,25 @@
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-            "role": "author",
-            "raw_affiliation": "Department of pataphysics"
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-    "refs": [],
-    "abstracts": []
+  "extra": {
+    "datacite": {},
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+  },
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+  "release_type": "article",
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+      "role": "author",
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+    }
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+  "refs": [],
+  "abstracts": []
 }