Visualizza wikitesto di Xapian

{{Infobox Software
| name = Xapian
| logo = 
| screenshot = 
| caption = 
| developer = xapian.org
| latest_release_version = 1.0.13
| latest_release_date = 2009-05-23
| latest_preview_version =
| latest_preview_date = 
| operating_system = [[Cross-platform]]
| platform = 
| genre = [[Search algorithm|Search]] and [[Index (information technology)|index]] [[Application programming interface|API]].
| license = [[GNU General Public License]]
| website = [http://xapian.org/ xapian.org]
}}
'''Xapian''' is an [[open source]] probabilistic [[information retrieval]] library, released under the [[GNU General Public License]] (GPL). That is, it is a full text search engine library for programmers.

It is written in [[C++]], with bindings to allow use from [[Perl]], [[Python (programming language)|Python]], [[PHP]], [[Java (Sun)|Java]], [[Tcl]], [[C Sharp (programming language)|C#]], and [[Ruby programming language|Ruby]]. Xapian is highly portable and runs on [[Linux]], [[Mac OS X]], [[FreeBSD]], [[NetBSD]], [[OpenBSD]], [[Solaris operating system|Solaris]], [[HP-UX]], [[Tru64]], [[IRIX]], [[Microsoft Windows]]<ref>[http://xapian.org/features Features of Xapian]</ref>, [[GNU Hurd]]<ref>[http://buildd.debian-ports.org/fetch.php?&pkg=xapian-core&ver=1.0.12-2&arch=hurd-i386&stamp=1242995814&file=log&as=raw Debian buildd success report for GNU Hurd]</ref>, and [[OS/2]]<ref>[http://freshmeat.net/projects/xapian/releases/273896 Freshmeat announcement for Xapian 1.0.6]</ref>.

Xapian is designed to be a highly adaptable toolkit to allow developers to easily add advanced indexing and search facilities to their own applications.

A growing number of organisations and projects are known to be using Xapian including [[Debian]], [[Gmane]], [[Die Zeit]], [[Delicious_(website)|Delicious]], [[MoinMoin]], and [[One Laptop per Child]].<ref>[http://xapian.org/users.php Users of Xapian]</ref>

== Features ==
* Transactions: if database update fails in the middle of a transaction, the database is guaranteed to remain in a consistent state.
* Simultaneous search and update, with new documents being immediately visible.
* Support for large databases: Xapian has been proven to be scalable to hundreds of millions of documents.
* Accurate probabilistic ranking: more relevant documents are listed first.
* Phrase and proximity searching.
* Relevance feedback, which improves ranking and can expand a query, find related documents, categorise documents etc.
* Structured Boolean queries, e.g. "race AND condition NOT horse"
* Wildcard search, e.g. "wiki*"
* Spelling correction
* Omega, a packaged solution for adding a search engine to a web site or intranet. Omega can easily be extended and adapted to fit changing requirements.

== References ==
<references/>

== External links ==
{{portal|Free software|Free Software Portal Logo.svg}}
* http://www.xapian.org is the Xapian project website.
* [http://www.oligarchy.co.uk/xapian.html Oligarchy Ltd.] and [http://www.lemurconsulting.com/Products/Xapian/Overview.shtml Lemur Consulting Ltd.] offer commercial support, consultancy and bespoke development for Xapian.
* [http://code.google.com/p/xappy/ http://code.google.com/p/xappy/] is a set of feature rich Python bindings for Xapian.
* [http://code.google.com/p/flaxcode/ http://code.google.com/p/flaxcode/] is a project to build a complete open-source enterprise search engine based on Xapian.
* [http://www.recoll.org Recoll] is a desktop search tool based on Xapian.

[[Category:Free search engine software]]

[[fr:Xapian]]