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Querying XML

Querying XML. XQuery. XQuery. Querying XML Not nearly as mature as Querying Relational Newer No underlying algebra Sequence of development 1. XPath 2. XSLT 3. XQuery. XQuery. XQuery Expression language (compositional) Each expression operates on & returns

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Querying XML

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  1. Querying XML XQuery

  2. XQuery Querying XML Not nearly as mature as Querying Relational • Newer • No underlying algebra Sequence of development 1. XPath 2. XSLT 3. XQuery

  3. XQuery XQuery • Expression language (compositional) • Each expression operates on & returns sequence of elements • XPath is one type of expression

  4. XQuery XQuery: FLWOR expression • All except Return are optional • For and Let can be repeated and interleaved • For$varinexpr • Let $var:=expr Where condition Order Byexpr Returnexpr

  5. XQuery Mixing queries and XML <Result> {…query goes here…} </Result> Demo: XQueryexamples over bookstore data

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