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Secure XML: The New Syntax for Signatures and Encryption by Kitty Niles, Donald E. Eastlake

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7.3. XPointer

XPointer is the syntax you use for the most general addressing of parts of an XML object [XPointer]. When an HTTP URI references XML, any fragment specifier to select a portion of the XML is written in XPointer syntax. XPointer can also be called explicitly to extract a subset of data (see Chapter 19). Note that XPointer does not include any way to point into the DTD or XML declaration for a document.

XPointer extends XPath so that you can use it in the following ways:

  • As a fragment identifier in a URI reference

  • To locate information by string matching

  • To address points and ranges within XML

In XML Security URIs, you should rarely encounter ...

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