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Querying XML XPath Jennifer Widom XPath Querying XML Not nearly as mature as Querying Relational Newer No underlying algebra Sequence of development 1. XPath 2. XSLT 3. XQuery Jennifer Widom XPath XPath = Path expressions + Conditions Basic Think of XML as a tree Constructs Jennifer Widom XPath XPath = Path expressions + Conditions Built-in functions (lots of them) Navigation “axes” (13 of them) Jennifer Widom 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 Jennifer Widom
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Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.
