Subject: Re: Can a match attribute use a non-pattern expression? From: Keith Visco <kvisco@xxxxxxxxx> Date: Tue, 04 May 1999 17:54:35 -0400 |
Elliotte, Axis Identifiers are a part of location paths... >From Section 6.1 [3] RelativeLocationPath ::= Step | ... [4] Step = AxisIdentifier '(' NodeTestPredicate ')' | AbbreviatedStep -Keith Elliotte Rusty Harold wrote: > > In the latest XSL draft, section 7.2 states: > > The match attribute is a *Pattern* that identifies the source node or > nodes to which the rule applies. > > According to section 6.3: > > A *Pattern* is set of location path patterns separated by |. A location > path pattern is a location path none of the steps of which use either > AxisIdentifiers or . or ... Location path patterns can also start with > an id() or key() function call with a literal argument (see [6.2.2 > Node-sets]). Predicates in a pattern can use arbitrary expressions just > like predicates in a location path. > > I'm particularly concerned about that bit about not using Axis > Identifiers which are defined in production 5 as from-ancestors, > from-ancestors-or-self, from-attributes, from-children, from-self, etc. > > In other words it seems that section 7.2 says that match attribute must > use the abbreviated syntax. > > Section 7.3 states that "A select attribute can be used to process nodes > selected by an expression instead of all children. The value of the > select attribute is a NodeSetExpr." Thus this restriction only seems to > aply to match attributes, not to select attributes. > > What's the reasoning behind this? Why is match restricted to patterns > while select is not? > > +-----------------------+------------------------+-------------------+ > | Elliotte Rusty Harold | elharo@xxxxxxxxxxxxxxx | Writer/Programmer | > +-----------------------+------------------------+-------------------+ > | Java I/O (O'Reilly & Associates, 1999) | > | http://metalab.unc.edu/javafaq/books/javaio/ | > | http://www.amazon.com/exec/obidos/ISBN=1565924851/cafeaulaitA/ | > +----------------------------------+---------------------------------+ > | Read Cafe au Lait for Java News: http://metalab.unc.edu/javafaq/ | > | Read Cafe con Leche for XML News: http://metalab.unc.edu/xml/ | > +----------------------------------+---------------------------------+ > > XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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