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https://issues.apache.org/jira/browse/LUCENE-5627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018114#comment-14018114
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Paul Elschot commented on LUCENE-5627:
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The javadocs here contain some references on what was used to make this.
Meanwhile I had another look around and found two somewhat similar
implementations:
Luxdb: https://github.com/msokolov/lux
This uses a TaggedTokenStream for the XML tags, see
http://www.slideshare.net/lucenerevolution/querying-rich-text-with-xquery
Fangorn: https://code.google.com/p/fangorn/
This indexes each tag by adding a payload with four position numbers (left,
right, depth, parent).
Its target is large treebanks of linguistically parsed text.
A first impression:
Both are based on Lucene and add a tree of XML tags like the label tree here.
They have a query language implementation which is not available here.
They do not have labeled fragments in the sense of having 0..n tokens in more
than one field that can form a single leaf in the tag tree.
> Positional joins
> ----------------
>
> Key: LUCENE-5627
> URL: https://issues.apache.org/jira/browse/LUCENE-5627
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Paul Elschot
> Priority: Minor
>
> Prototype of analysis and search for labeled fragments
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