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Querying XML

Querying XML. XPath. XPath. Querying XML Not nearly as mature as Querying Relational Newer No underlying algebra Sequence of development 1. XPath 2. XSLT 3. XQuery. XPath. XPath Think of XML as a tree. = Path expressions + Conditions. Basic Constructs. XPath. XPath

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Querying XML

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  1. Querying XML XPath

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

  3. XPath XPath Think of XML as a tree = Path expressions + Conditions Basic Constructs

  4. XPath XPath Built-in functions (lots of them) Navigation “axes” (13 of them) = Path expressions + Conditions

  5. XPath More Details XPath queries operate on & return sequence of elements • XML document • XML stream Sometimes result can be expressed as XML, not always Demo: XPath examples over bookstore data

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