Subject: Re: [xsl] flatten a hierachy and change positions From: Jeni Tennison <jeni@xxxxxxxxxxxxxxxx> Date: Thu, 25 Sep 2003 10:18:18 +0100 |
Hi Andreas, > I have to make some suppositions first, however... > > You have: >> > <root> >> <g1> >> <u1><s></s></u1> > </g1> <!-- I presume... --> >> <g2> >> <u2></u2> >> </g2> > </root> > >> > You need: >> >> <u1></u1> >> <s></s> >> <g1></g1> >> <u2></u2> >> <g2></g2> > <root></root> > > Correct? Needs some kind of a recursive template, I think. You *could* also do it by iterating through all the elements in the document, after collecting them with the path "//*": <xsl:for-each select="//*"> <xsl:copy /> </xsl:for-each> This gives the output: <root /> <g1 /> <u1 /> <s /> <g2 /> <u2 /> Now there's some reordering to do. I don't think that the order that Elke originally asked for is derivable from the order of the elements in the document, but the ordering that your recursive template gave is: it's the order in which the end tags appear, which is the same as the number of preceding elements + the number of descendant elements. So you could order them with: <xsl:for-each select="//*"> <xsl:sort select="count(preceding::* | descendant::*)" data-type="number" /> <xsl:copy /> </xsl:for-each> Having said that, sorting on a count of preceding and descendant elements is going to be pretty inefficient if you have a document of any size, so a recursive approach similar to yours is likely to be better. I'd do it with the single template: <xsl:template match="*"> <xsl:apply-templates select="*" /> <xsl:copy /> </xsl:template> Which says that to process an element, you process its children first and then create a copy of the element itself. > Needs some adjustments, as I received error messages complaining > about 'Illegal values being used for attribute name' (Xalan-J > 2.5.1). The error occurs when you call the 'another' template: > <xsl:template name="another"> > <xsl:param name="parname" select="empty"/> > > <xsl:element name="{$parname}"> > <xsl:value-of select="$parname"/> > </xsl:element> > </xsl:template> with an empty string as the value of the $parname parameter. If $parname is an empty string then name="{$parname}" resolves to name="", which means that you're not supplying a name for the element that you want created. This is an error, but an XSLT processor can recover from it by not creating the element. The reason that $parname is an empty string is that in the 'one' template, you're iterating over all the children of the $parnode using: > <xsl:for-each select="$parnode/node()"> > <xsl:call-template name="one"> > <xsl:with-param name="parnode" select="."/> > </xsl:call-template> > <xsl:call-template name="another"> > <xsl:with-param name="parname" select="name(.)"/> > </xsl:call-template> > </xsl:for-each> Some of the children of $parnode are likely to be text nodes; text nodes don't have names. If you only select the element children of the $parnode instead, with $parnode/*, then you don't get the error. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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