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Solr is a web services interface to Lucene. It is used in the Nines project, along with a user-presentation layer called Collex.


  • Faceted browsing
  • Performance enhancements
  • Highlighting of matched terms in result sets

Solr vs. XTF:

  • Solr has a web-based interface, while XTF is primarily commandline/filesystem.
  • Solr can cache result sets for greater efficiency.
  • XTF has dynaXML, which is very useful for processing XML content.