4 files changed, 47 insertions, 6 deletions
diff --git a/docs/TR-20210808100000-IA-WDS-REFCAT/main.pdf b/docs/TR-20210808100000-IA-WDS-REFCAT/main.pdf
index f4273e4..97cfc56 100644
--- a/docs/TR-20210808100000-IA-WDS-REFCAT/main.pdf
+++ b/docs/TR-20210808100000-IA-WDS-REFCAT/main.pdf
diff --git a/docs/TR-20210808100000-IA-WDS-REFCAT/main.tex b/docs/TR-20210808100000-IA-WDS-REFCAT/main.tex
index b278149..b020a47 100644
--- a/docs/TR-20210808100000-IA-WDS-REFCAT/main.tex
+++ b/docs/TR-20210808100000-IA-WDS-REFCAT/main.tex
@@ -322,10 +322,12 @@ is processed continously or in batches). Reference data from PDF documents has
 been extracted with GROBID\footnote{GROBID
 	\href{https://github.com/kermitt2/grobid/releases/tag/0.5.5}{v0.5.5}}, with the
 TEI-XML results being cached locally in a key-value store accessible with an S3
-API. Archived PDF documents result from dedicated web-scale crawls of scholarly
-domains conducted with
-Heritrix\footnote{\href{https://github.com/internetarchive/heritrix3}{https://github.com/internetarchive/heritrix3}} (and
-other crawl technologies) and a variety of seed lists targeting journal
+API\footnote{Currently,
+	\href{https://github.com/chrislusf/seaweedfs}{https://github.com/chrislusf/seaweedfs}
+	is used}. Archived PDF documents result from dedicated web-scale crawls of
+scholarly domains conducted with
+Heritrix\footnote{\href{https://github.com/internetarchive/heritrix3}{https://github.com/internetarchive/heritrix3}}
+(and other crawl technologies) and a variety of seed lists targeting journal
 homepages, repositories, dataset providers, aggregators, web archives and other
 venues. A processing pipeline merges catalog data from the primary database and
 cached data from the key-value store and generates the set of about 2.5B
@@ -367,6 +369,13 @@ derivations, as data dependencies are encoded with the help of the
 orchestrator. Within the tasks, we also utilize classic platform tools such as
 \emph{sort}~\citep{mcilroy1971research}.
 
+During a last processing step, we fuse reference matches and unmatched items
+into a single, indexable file. This step includes deduplication of different
+matching methods (e.g. prefer exact matches over fuzzy matches). This file is
+indexed into an search index and serves both matched and unmatched references
+for the web application, allowing for further collection of feedback on match
+quality and possible improvements.
+
 With a few schema conversions, fuzzy matching can be applied to Wikipedia
 articles and Open Library (edition) records as well. The aspect of precision
 and recall are represented by the two stages: we are generous in the match
@@ -416,6 +425,19 @@ This work is partially supported by a grant from the \emph{Andrew W. Mellon
 
 \section{Appendix A}
 
+Figure~\ref{fig:types} shows a schematics of actual and possible reference entities.
+
+\begin{figure}[h]
+	\centering
+	\includegraphics[width=0.45\textwidth]{refs_types.png}
+	\caption{Schematics of the main reference entities; green: included in the
+		corpus; orange: currently in development; gray: Planned, but not in
+		development; red: long-term desiderata.}
+	\label{fig:types}
+\end{figure}
+
+\section{Appendix B}
+
 
 A note on data quality: While we implement various data quality measures,
 real-world data, especially coming from many different sources will contain
@@ -491,7 +513,8 @@ more easily (see~Table~\ref{table:matches}).
 	\end{center}
 \end{table}
 
-\bibliographystyle{abbrv}
-% \bibliographystyle{plainnat}
+
+% \bibliographystyle{abbrv}
+\bibliographystyle{plainnat}
 \bibliography{refs}
 \end{document}
diff --git a/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.dot b/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.dot
new file mode 100644
index 0000000..ec8cc00
--- /dev/null
+++ b/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.dot
@@ -0,0 +1,18 @@
+// dot -Tpng refs_types.dot > refs_types.png
+digraph {
+  Papers[label="Papers\n(fatcat; incl. datasets)",shape=rect]
+  Books[label="Books\n(openlibrary)",shape=rect]
+  Encyclopedia[label="Encyclopedia\n(wikipedia)",shape=rect]
+  Web[label="Web\n(wayback)",shape=rect]
+  // OtherMedia[label="Other Media? TODO\n(archive.org)", color=orange]
+  Unmatched[label="Unknown/Unmatched", color=grey]
+  Papers -> Papers[color=green,label="1.3 billion",penwidth=2]
+  Papers -> Unmatched[color=orange,label="0.7 billion",penwidth=2]
+  Papers -> Books[color=green,label="20 million"]
+  Papers -> Web[color=orange,label="WIP / 25 million"]
+  Books -> Papers[color=red]
+  Books -> Web[color=red]
+  Books -> Books[color=red]
+  Encyclopedia -> Papers[color=green,label="1.3 million"]
+  Encyclopedia -> Books[color=gray,label="TODO"]
+}
diff --git a/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.png b/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.png
new file mode 100644
index 0000000..d3cd278
--- /dev/null
+++ b/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.png