Subject: RE: [xsl] The fundamental differences between XPath and XSLT? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Wed, 9 Apr 2008 12:39:16 +0100 |
> 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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