Querying XML XPath.

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Presentation transcript:

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

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