Lux - XML Search engine

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Lux is an open source XML search engine using Lucene /Solr and Saxon XQuery/XSLT processor. Lux provides XML-aware indexing, an XQuery 1.0 optimizer that rewrites queries to use the indexes, and a function library for interacting with Lucene via XQuery. These capabilities are tightly integrated with Solr, and leverage its application framework in order to deliver a REST service, application server, and supporting tools.

Lux provides several kinds of index: XML full-text indexes, an XML path index, and configurable XPath indexes.

http://luxdb.org/
https://github.com/msokolov/lux

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