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The OpenSearch response elements can be used to extend existing syndication formats, such as RSS and Atom, with the extra metadata needed to return search results .

Home - OpenSearch (Navigation privée)

http://www.opensearch.org/Home
http://www.atomz.com/ Atomz Search is a hosted application and is delivered completely over the Internet. How do we do it for free? By creating a professional site search solution delivered as a hosted service and supporting our costs through text-based advertisements.

Atomz Site Search (Navigation privée)

SearchTools.com

http://www.searchtools.com/info/metadata.html . It can be as simple as an author's name or as complex as a geographic code or a controlled-vocabulary subject heading. Library catalogs are remote meta data, as are book reviews, indexes to art collections and summaries.