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RE: [xsl] grouping nesting items, including following items
Subject: RE: [xsl] grouping nesting items, including following items From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Tue, 19 Jun 2007 09:30:11 +0100 |
A tricky one, it has come up before but I don't think it will be easy to find the thread. On that occasion I think the break was indicated by a <newpage/> element that could appear at any depth, but the principle is the same. I think the basic approach is this. When processing a <point> that contains a descendant <newpage/>, you need to split it into two <point> elements, the first containing everything before the <newpage/>, the second containing everything after. And it also applies recursively, of course, to the children. So it's something like this: <xsl:template match="point"> <xsl:copy-of select="."/> </xsl:template> <xsl:template match="point[descendant::newpage]"> <xsl:variable name="this" select="."/> <xsl:variable name="np" select="descendant::newpage[1]"/> <point id="{@id}" part="1"> <xsl:apply-templates select="child::node()[. << $np or (. intersect $np/ancestor::node())]"/> </point> <newpage/> <xsl:variable name="remainder as="element(point)"> <point id="{@id}" part="{1+position()}"> <xsl:copy-of select="$this/child::node()[. >> $np or (. intersect $np/ancestor::node())]"/> </point> </xsl:variable> <xsl:apply-templates select="$remainder"/> </xsl:template> This basically creates a structure in which the <newpage/> elements are propogated to the top level, and every ancestor of a <newpage/> element is duplicated either side of this element, but with unsplit <point> elements appearing one side or the other. You've then got a simpler second stage of processing in which the pages are identified at the top level (quite possibly you can do this in the same pass but I think it's useful to get the basic splitting logic right first). I've used some 2.0 constructs here (and for clarity I've used the << and >> operators without escaping) but they can probably all be translated into 1.0 equivalents with a bit of ingenuity and verbosity. You can probably substitute point[newSlide='true'] for my <newpage/> elements, it will add a little bit of extra complexity. I'd suggest getting this working on a simplified version of the problem first and when you've got something that works, extend it to handle the real problem. This is untested and almost certainly contains bugs, but I hope the general idea comes across. Michael Kay http://www.saxonica.com/ > -----Original Message----- > From: Don Smith [mailto:dtsmithisogen@xxxxxxxxx] > Sent: 19 June 2007 08:48 > To: XSLT > Subject: [xsl] grouping nesting items, including following items > > I can't quite figure out how to group nested items and also > pick up items on the following axis for a given group. Here's > a sample source: > > <slide title="Introduction" id="x1"> > <point id="x2" > > <text>First point</text> > <subpoints id="x3"> > <point id="x3a"> > <text>First point, subpoint 1</text> > </point> > <point id="x3b"> > <text>First point, subpoint 2</text> > </point> > <point id="x3c"> > <text>First point, subpoint 3</text> > <subpoints id="x3c1"> > <point id="x3c1a" newSlide="true" title="Intro (cont.)"> > <text>First point, subpoint 3, sub-subpoint 1 on new > slide</text> > </point> > <point id="x3c1b"> > <text>First point 4, subpoint 3, sub-subpoint 2 on new > slide</text> > </point> > </subpoints> > </point> > <point id="x4d"> > <text>First point, subpoint 4 on new slide</text> > </point> > </subpoints> > </point> > <point id="x5" > > <text>Second point, on new slide</text> </point> </slide> > > Note the attribute "newSlide" on <point id="x3c1a">: I need > this element, all its descendants (if any), and everything > that follows, to be in a different group than everything that > comes before. Ideally, this would mean each group is placed > in its own document using <xsl:result-document>. > > This is just one example, but "newSlide='true'" can occur on > any <point> or even any <subpoints>. > > Thanks, > > Don > > > > > ______________________________________________________________ > ______________________ > Finding fabulous fares is fun. > Let Yahoo! FareChase search your favorite travel sites to > find flight and hotel bargains. > http://farechase.yahoo.com/promo-generic-14795097
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