Relative XPointers
Normally, an XPointer is a fragment identifier attached to a URL.
The root node of the document the URL points to is the context
location for the XPointer. However, XPointers can also be used by
themselves without explicit URLs in XML documents. By default, the
context node for such an XPointer is the root node of
the document where the XPointer appears. However, either the
here( ) or the origin() function can change the context
node for the XPointer’s XPath expression.
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