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Z39.50 and W3C XML QL

Z39.50 and W3C XML QL. Mark Needleman Data Research Associates, Inc ZIG Meeting December 2000. XML QL. Query Language Only Formal Data Model and Algebra May Have multiple syntaxes - but 1 language Protocol Independent

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Z39.50 and W3C XML QL

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  1. Z39.50 and W3C XML QL Mark Needleman Data Research Associates, Inc ZIG Meeting December 2000

  2. XML QL • Query Language Only • Formal Data Model and Algebra • May Have multiple syntaxes - but 1 language • Protocol Independent • May embed some of the functionality of Z39.50 directly into the language

  3. Z39.50 • More than just a Query Language - a protocol with supporting infrastructure • Z39.50 model supports multiple types of queries • Provides session management • Provides result set management • Provides supporting information retrieval functionality beyond the query

  4. XML Ql vs Z39.50 • QL - XML based (at least one syntax) • Z39.50 ASN.1/BER based • QL - Protocol Independent • Z39.50 - Very much protocol dependent • QL - all functionality provided for and expressed in the query language • Z39.50- provides supporting information retrieval functionality beyond the query • QL - A De facto standard? • Z39.50 - An “official” standard

  5. Possible Futures • Add QL as one more Query type in Z39.50? • Abandon Z39.50 and just use functionality and model provided by QL? • Some combination of the two?

  6. Z39.50 in the Future? • Retain concepts and model of information retrieval provided by current protocol expressed using XML QL but run over a more modern transport like HTTP and/or XML Protocol

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