[[Where does one read about XPointer, and what does it do in 
relation to [XML] ]]?

XPointer is an adjunct to Uniform Resource Identifiers (URIs) to allow XML resources to be linked into. Unlike [HTML], it can be used to get to any arbitrary region inside an XML file.


See also [XLink].

Both the XLink and the XPointer specifications are W3C (http://www.w3.org/XML/Linking) Recommendations, which makes them loosely considered a standard. 

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