XPointer build on top of XPath and add the following:
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A schema mechanism #xptr(...), could possibly be cascaded
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Ranges: to be able to point to contiguous sets of nodes
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String: to be able to select strings, not only full nodes
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Absolute path: / (root), id(), here() and origin()
basically what is needed to be able to express a selection
XPointer disable variables supports in XPath