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From "J. Delgado" <joaquin.delg...@gmail.com>
Subject DB-XML/Lucene integration
Date Fri, 11 May 2007 18:05:36 GMT
The ever growing presence of mingled structured and unstructured data is a
fact of life and modern systems we have to deal with. Clearly, the tendency
is that full-text indexing is moving towards DB functionality, i.e.
<attribute,value> fields for projection/filtering, sorting, faceted queries,
transactional CRUD operations etc. Though set manipulation is not Lucene's
or Solr's forte, the document-object model maps very well to rows of
relational sets or tables, evermore when CLOBs and TEXT fields where
introduced.

On the other hand, relational databases with XML and OO extensions and
native XML repositories still have to deal with the problem of RANKING
unstructured text and combination of text fragments and structured
conditions, thus  dealing no longer just with a set/relational model  that
yields binary answers but extending their query languages to handled the
concept of fuzziness, relevance, etc. ( e.g. SQL/MM, XQuery-FullText).

I would like once again to open this can of worms, and perhaps think out of
the box, without classifying DB and Full-Text as simply different, as we
analyze concepts to further understand the real path for evolution of
Lucene/Sorl

Here is a very interesting attempt to create a special type of "index"
called Domain Index to query unstructured data within Oracle by Marcelo
Ochoa:
https://issues.apache.org/jira/browse/LUCENE-724

Other interesting articles:

XQuery 1.0 - Full-Text:
http://www.w3.org/TR/xquery-full-text/
SQL/MM Full-Text
http://www.wiscorp.com/2CD1R1-02-fulltext-2001-12.pdf

Discussions on *XML data model vs. relational model*
http://www.xml.com/cs/user/view/cs_msg/2645

http://www.w3.org/TR/xpath-datamodel/
http://en.wikipedia.org/wiki/Relational_model

-- Joaquin Delgado

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