Reference

A9.com - OpenSearch
http://opensearch.a9.com/

A9.com - OpenSearch - OpenSearch 1.1: Description
http://opensearch.a9.com/spec/1.1/description/

A9.com - OpenSearch - OpenSearch 1.1: Query Syntax
http://opensearch.a9.com/spec/1.1/querysyntax/

A9.com - OpenSearch - OpenSearch 1.1: Response
http://opensearch.a9.com/spec/1.1/response/

A9.com - OpenSearch - OpenSearch 1.1: Query
http://opensearch.a9.com/spec/1.1/query/

スラッシュドット ジャパン - 2005-04-24 - 「OpenSearch」でおもしろい検索サービスは作れるか？
http://slashdot.jp/article.pl?sid=05/04/24/215214

Boredom, Tiredness and Idleness - 2005-04-20 - OpenSearchBar - Internet Explorer Toolbar
http://luckypines.blogspot.com/2005/04/opensearchbar-internet-explorer.html

blog.bulknews.net - 2005-04-20 - OpenSearchBar
http://blog.bulknews.net/mt/archives/001670.html

via

IT用語辞典バイナリ - OpenSearch オープンサーチとは
http://www.sophia-it.com/content/OpenSearch