XPointer and XPath
XPath models an XML document as a hierarchy of nodes. XPointer incorporates the concept of a node and also makes use of XPath functions, some of which were discussed in Chapter 9.
The XPath notion of a node is generalized in XPointer to include the additional notions of a point and a range. The following XML code snippet can help illustrate these concepts.
<text>Here is some text.</text>
All the text between the start and end tags of the text element is the value of a corresponding text node. The point exactly between the initial H and the first e of Here is a point. That type of point is a character-point.
A range could be the text string is some, with the starting point between the space character and the initial i of ...
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