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20 lines
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Plaintext
20 lines
1.0 KiB
Plaintext
CQL::Parser provides a mechanism to parse Common Query Language (CQL)
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statements. The best description of CQL comes from the CQL homepage at the
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Library of Congress http://www.loc.gov/z3950/agency/zing/cql/
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CQL is a formal language for representing queries to information retrieval
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systems such as web indexes, bibliographic catalogs and museum collection
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information. The CQL design objective is that queries be human readable
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and human writable, and that the language be intuitive while maintaining
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the expressiveness of more complex languages.
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A CQL statement can be as simple as a single keyword, or as complicated as
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a set of compoenents indicating search indexes, relations, relational
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modifiers, proximity clauses and boolean logic. CQL::Parser will parse CQL
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statements and return the root node for a tree of nodes which describes
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the CQL statement. This data structure can then be used by a client
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application to analyze the statement, and possibly turn it into a query
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for a local repository.
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WWW: http://search.cpan.org/dist/CQL-Parser/
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