XML namespace
OpenSearch 1.1
Describes a search endpoint so a client can build query URLs, and adds totalResults, startIndex and itemsPerPage to search-result feeds.
xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"An OpenSearch description document tells a client how to construct a query URL for a site's search. The same namespace also supplies totalResults, startIndex and itemsPerPage, which paginated Atom or RSS result feeds use.
The a9.com URI reflects the spec's origins at Amazon's A9 and remains the canonical identifier.
- URI
http://a9.com/-/spec/opensearch/1.1/- Prefix
opensearch- Elements
OpenSearchDescriptionUrltotalResultsstartIndexitemsPerPage
Formats that use it
Atom 1.0
<feed>The IETF-standardised syndication format: namespaced from the root, strictly typed, and unambiguous about dates in a way RSS 2.0 never was.
RSS 2.0
<rss>The most widely deployed syndication format: namespace-free at its core, extension-heavy in practice, and unopinionated about almost everything.
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