Re: Pattern question: first child of first descendant
At 12:45 PM 3/24/2009, you wrote:
>>match="entry[. is >>ancestor::table/descendant::entry]/*[self::title|self::para]" > >This will match the first title or para child of a first entry >descendant of a table, but if you have > ><entry> > <label/> > <title/> > <para/> ></entry> > >the title will be matched. > >I think the spec needs a bit of clarification. :-)
Not a problem. Given what you say, I believe Mike read this one correctly.
I'm not answering to the many helpful posts on this individually. Andrew's link on "//" was very interesting (the gotcha would have resp. has got me for sure). I'll try to summarize the idea behind the solution:
That words, and there are also other techniques for getting around the limitations in patterns.
(Nor am I one to complain about those limitations.)
2. In the predicate, use the ancestor axis to "go back" to the element you wanted to start from originally, then formulate your path as you would have done without patterns' limitations and check for node identity on the target.
That works. So, often, does not using a pattern at all. For example, let's say you had a bit of run-in text that you wanted to lead only the first title or para inside the first entry inside a table:
<xsl:template match="entry/title | entry/para"> <h5 class="entry-title"> <xsl:call-template name="run-in"/> <xsl:apply-templates/> </h5> </xsl:template>
<xsl:template match="entry/para"> <p> <xsl:call-template name="run-in"/> <xsl:apply-templates/> </p> </xsl:template>
<xsl:template name="run-in"> <!-- a run-in label is inserted into the first title or para that appears in the first entry of a table --> <xsl:if test=". is ancestor::table/descendant::entry/(title|para)"> ... </xsl:if> </xsl:template>
This may not compile into anything quite so tight as doing it with a match pattern, but it is arguably easier to read and maintain, especially by the XSLT neophyte who takes over your stylesheet. And the logic is very flexible and adaptable.
====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. http://www.mulberrytech.com 17 West Jefferson Street Direct Phone: 301/315-9635 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ======================================================================
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