1 files changed, 78 insertions, 0 deletions
diff --git a/guide/src/container_extra.md b/guide/src/container_extra.md
new file mode 100644
index 00000000..224b7e8a
--- /dev/null
+++ b/guide/src/container_extra.md
@@ -0,0 +1,78 @@
+
+'extra' fields:
+
+    doaj
+        as_of: datetime of most recent check; if not set, not actually in DOAJ
+        seal: bool
+        work_level: bool (are work-level publications deposited with DOAJ?)
+        archiving: array, can include 'library' or 'other'
+    road
+        as_of: datetime of most recent check; if not set, not actually in ROAD
+    pubmed (TODO: delete?)
+        as_of: datetime of most recent check; if not set, not actually indexed in pubmed
+    norwegian (TODO: drop this?)
+        as_of: datetime of most recent check; if not set, not actually indexed in pubmed
+        id (integer)
+        level (integer; 0-2)
+    kbart
+        lockss
+            year_rle
+            volume_rle
+        portico
+            ...
+        clockss
+            ...
+    sherpa_romeo
+        color
+    jstor
+        year_rle
+        volume_rle
+    scopus
+        id
+        TODO: print/electronic distinction?
+    wos
+        id
+    doi
+        crossref_doi: DOI of the title in crossref (if exists)
+        prefixes: array of strings (DOI prefixes, up to the '/'; any registrar, not just Crossref)
+    ia
+        sim
+            nap_id
+            year_rle
+            volume_rle
+        longtail: boolean
+        homepage
+            as_of: datetime of last attempt
+            url
+            status: HTTP/heritrix status of homepage crawl
+
+    issnp: string
+    issne: string
+    coden: string
+    abbrev: string
+    oclc_id: string (TODO: lookup?)
+    lccn_id: string (TODO: lookup?)
+    dblb_id: string
+    default_license: slug
+    original_name: native name (if name is translated)
+    platform: hosting platform: OJS, wordpress, scielo, etc
+    mimetypes: array of strings (eg, 'application/pdf', 'text/html')
+    first_year: year (integer)
+    last_year: if publishing has stopped
+    primary_language: single ISO code, or 'mixed'
+    languages: array of ISO codes
+    region: TODO: continent/world-region
+    nation: shortcode of nation
+    discipline: TODO: highest-level subject; "life science", "humanities", etc
+    field: TODO: narrower description of field
+    subjects: TODO?
+    url: homepage
+    is_oa: boolean. If true, can assume all releases under this container are "Open Access"
+    TODO: domains, if exclusive?
+    TODO: fulltext_regex, if a known pattern?
+
+For KBART, etc:
+    We "over-count" on the assumption that "in-progress" status works will soon actually be preserved.
+    year and volume spans are run-length-encoded arrays, using integers:
+        - if an integer, means that year is preserved
+        - if an array of length 2, means everything between the two numbers (inclusive) is preserved