In Chapters 2 and 3, you learned how to read and write XML documents by using the XmlDocument, XmlReader, and XmlWriter classes. These classes allow you to access the underlying documents, but by themselves they hardly provide a way to query and retrieve the data. That is why we need something that allows us to navigate, query, and retrieve data from XML documents easily and efficiently. The XPath standard is designed to do just that.
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4. Accessing XML Documents Using the XPath Data Model
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The .NET Framework namespace System.Xml.XPath provides a complete set of classes that allow you to query and retrieve data ...