need clarifications on XPath vs pattern match
Didier PH Martin
martind at netfolder.com
Tue Dec 14 00:42:26 GMT 1999
Not quite. See XSLT, section 5.2:
"A pattern must match the grammar for Pattern. A Pattern is a set of
location path patterns separated by |. A location path pattern is a
location path whose steps all use only the child or attribute axes.
Although patterns must not use the descendant-or-self axis, patterns
may use the // operator as well as the / operator. Location path
patterns can also start with an id or key function call with a literal
argument. Predicates in a pattern can use arbitrary expressions just
like predicates in a location path."
This paragraph is followed by a grammar spelling out the above.
See also XPath, section 2 "Location Paths".
so, basically a pattern match could be a collection of XPath location path
Can we say that?
"Node-sets" are defined in XPath, section 3.3:
"A location path can be used as an expression. The expression returns
the set of nodes selected by the path."
I expected a better definition. don't you? Obviously the name node-set
convey implicitly the meanings of node and set. A set being a collection,
then we can say that a node-set is a collection of nodes. However, I
expected something more formal for something which is as fundamental. Again,
David, have we, or will we have a more formal definition of node-set in
Bottom line: you can't fully understand the XSLT spec. w/o first
understanding XPath. (Arguably, the reverse is true also. ;-)
Yes I noticed :-)
Didier PH Martin
mailto:martind at netfolder.com
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