This version features a new, faster, more compact database format and enhanced backwards compatibility with existing databases; a built-in replication system (so in a distributed system you only need to propagate the changes to a Xapian database across the network); a “Match Spy” interface to allow information about search results (such as facets) to be gathered efficiently; subclassable “Posting Sources” to allow extremely flexible search customisations and many more improvements and bug fixes. Nearly all of these improvements have been available previously in the 1.1 ‘development’ series – you can find out more about how development and stable releases differ on the Xapian RoadMap page.

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