On 09/04/2008, Costello, Roger L. <costello(_at_)mitre(_dot_)org> wrote:
1. An XPath expression operates on one or more in-memory node trees.
(a) True
(b) False
False.
E.g. substring-after("frederick", "fred") operates on zero node trees.
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
(b) False
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
(b) False
False - see (1)
4. An XSLT element operates on one or more in-memory node trees.
(a) True
(b) False
False. No node trees (whether in or out of memory) need be present.
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.")
(a) True
(b) False
False.
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.
(a) True
(b) False
False. Rather they are instances of the XPath Data Model (XDM).
An implementation might choose to use the DOM. I never would (it's disgusting).
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