Transcription of Query Languages for XML - Stanford University
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Query Languages for XML - Stanford University
1 Query Languages for XMLXPathXQueryXSLT2 The XPath/XQuery Data Model Corresponding to the fundamental relation of the relational model is: sequence of items. An item is primitive value, , integer or node(defined next).3 Principal Kinds of nodesrepresent entire pieces of a document consisting of some opening tag, its matching closing tag (if any), and everything in that are given values inside opening Nodes Formed by doc(URL) or document(URL). Example: doc(/usr/class/cs145 ) All XPath (and XQuery) queries refer to a doc node, either explicitly or implicitly. Example: key definitions in XML Schema have Xpath expressions that refer to the document described by the for Running Example<!
Query Languages for XML XPath XQuery XSLT. 2 The XPath/XQueryData Model Corresponding to the fundamental “relation” of the relational model is: sequence of items. An item is either: 1. A primitive value, e.g., integer or string. 2. A node (defined next). 3 Principal Kinds of Nodes 1. Document nodes represent entire
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