I have a few questions:
1. An XPath expression operates on one or more in-memory node trees.
(a) True
2. An XPath expression cannot change an in-memory node tree.
(More precisely, "Evaluating an XPath expression cannot
result in changes to any in-memory node trees.")
(a) True
3. XPath can only be used to:
- navigate through an in-memory node tree
- retrieve values from the in-memory node tree
- operate on the values it retrieves (the result of an
operation does not modify the in-memory node tree)
(a) True
4. An XSLT element operates on one or more in-memory node trees.
(a) True
5. An XSLT element can change an in-memory node tree. (More
precisely, "Evaluating an XSLT element can result in changes
to one or more in-memory node trees.")
(b) False - XSLT can create new trees but it cannot modify existing
trees.
6. The "in-memory node tree" referenced above is always a "DOM tree."
Thus, for example, (1) is more precisely phrased as: An XPath
expression operates on one or more DOM trees.
(b) False - the data model is XDM, which is subtly different from DOM
in a number of important ways. For example, namespaces are modelled quite
differently.
Michael Kay
http://www.saxonica.com/
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