The OpenSearch specification originated in a community effort built around Amazon’s The specification was intended to allow syndication of search results that could then be aggregated by one large index. OpenSearch provides a simple to use description of the search interface, which is called an OpenSearch Description document (OSDD). A client (e.g., a browser) can use this description to check which response formats are supported and how a query/filter can be formulated.

This specification is currently being maintained at and is available under the Creative Commons Attribution-ShareAlike 4.0 International license  (

Official model files and encoding schemas

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