This is the official manual for using Query API.

• Most information can be received from the API itself athttp://en.wikipedia.org/w/query.php
• User Manual -- Code samples in various languages, usage scenarios.
• Suggestion ideas should be postedhere.
• Some performance statistics
• Source Code
• Revision History
• #queryapi IRC channel

• 208 - API for external access
• 6277 - Modify database tables: add revision length to revisions table; add change in length (delta) to the recentchanges table.
• 6440 - Change indexes on pagelinks, templatelinks, and imagelinks tables to considerably optimize several queries.

  Note: both of the above database changes are discussed atproposed db schema changes page.

This project started as an IRC discussion betweenYuri Astrakhan,Tim Starling, andDaniel Kinzler. Tim gave a huge kick-start by implementing the very first property. Later, Yuri has implemented numerous queries and formats, and is currently maintaining this feature. As of July 1st, 2006, Query API receives over 275,000 requests per day.

Initially all of Query API code was developed using an excellent text editorNotepad++, but on July 1stNuSphere kindly donatedPhpED - anIDE forPHP with advanced debugging and profiling capabilities. I am very grateful to NuSphere for their support.