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Contextual Query Language (CQL), previously known as Common Query Language,〔(CQL: the Contextual Query Language: Specifications ) SRU: Search/Retrieval via URL, Standards, Library of Congress〕 is a formal language for representing queries to information retrieval systems such as search engines, bibliographic catalogs and museum collection information. Based on the semantics of Z39.50, its design objective is that queries be human readable and writable, and that the language be intuitive while maintaining the expressiveness of more complex query languages. It is being developed and maintained by the Z39.50 Maintenance Agency, part of the Library of Congress. == Examples of query syntax == Simple queries: dinosaur Queries using Boolean logic: dinosaur or bird Queries accessing publication indexes: publicationYear < 1980 Queries based on the proximity of words to each other in a document: ribs prox/distance<=5 chevrons Queries across multiple dimensions: date within "2002 2005" Queries based on relevance: subject any/relevant "fish frog" The latter example specifies using a specific algorithm for logistic regression.〔(Relevance Ranking Context Set version 1.1 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Contextual Query Language」の詳細全文を読む スポンサード リンク
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