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Xpointer




At the present time (late 2002), XPointer is divided among four specifications: a " Framework " which forms the basis for identifying XML fragments, a positional element addressing scheme, a scheme for Namespaces , and a scheme for XPath -based addressing.

The XPointer language is designed to address structural aspects of XML, including text content and other information objects created as a result of Parsing the document. Thus, it could be used to point to a section of a document highlighted by a user through a mouse drag action.

XPointer is encumbered by a technology Patent held by Sun Microsystems .


POSITIONAL ELEMENT ADDRESSING

The element() scheme introduces positional addressing of child elements. This is similar to a simple XPath address, but subsequent steps can only be numbers representing the position of a descendant relative to its branch on the tree.

For instance, given the following fragment:



the XPointer to bom would be:

element(foo/2/1)


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