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RE: Selecting a tree...

Subject: RE: Selecting a tree...
From: "McNally, David" <David.McNally@xxxxxxxxxx>
Date: Wed, 30 Jan 2002 12:47:30 -0500
xsl selecting element tree
I think this'll do it.  Rather than walking down the tree, I'm starting at
the bottom for each node, and walking back up, returning a TRUE value if I
ever hit a node with the correct rootname.  Then, if I get any TRUE values,
output the node - so each node only gets output once, no matter how many
true paths there are up to the rootname node.  There may be a way to handle
the test as a boolean - I'm just returning the string "TRUE" and then
testing for it.

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
<xsl:output method="xml" indent="yes"/>

<xsl:param name="rootnode" select="'root1'"/>

<xsl:template match="/">

<xsl:template match="document">

<xsl:template match="subnode">
	<xsl:call-template name="outputElement"/>

<xsl:template match="node">
	<xsl:variable name="thisTest">
		<xsl:call-template name="testParents"/>
	<xsl:if test="contains($thisTest,'TRUE')">
		<xsl:call-template name="outputElement"/>

<xsl:template name="testParents">
		<xsl:when test="@name=$rootnode">
				<xsl:call-template name="testParents"/>

<xsl:template name="outputElement">
	<xsl:element name="{name(.)}">
		<xsl:copy-of select="@*"/>



David McNally            Moody's Investors Service
Software Engineer        99 Church St, NY NY 10007 
David.McNally@xxxxxxxxxx            (212) 553-7475 

> -----Original Message-----
> From: Klaus-Georg Adams [mailto:Klaus-Georg.Adams@xxxxxxx]
> Sent: Wednesday, January 30, 2002 5:31 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Selecting a tree...
> Hi,
> I have an XML file which represents multiple trees like so:
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <!DOCTYPE document [
> <!ELEMENT document (node*)>
> <!ELEMENT node (subnode*)>
>                isroot (true|false) "false">
> <!ELEMENT subnode EMPTY>
> ]>
> <document>
>   <node name="root1" isroot="true">
>     <subnode name="node1"/>
>     <subnode name="node2"/>
>   </node>
>   <node name="root2" isroot="true">
>   </node>
>   <node name="node1">
>     <subnode name="node3"/>
>   </node>
>   <node name="node2">
>     <subnode name="node3"/>
>   </node>
>   <node name="node3"/>
> </document>
> A node can refer to subnodes by their name. Names are unique. There
> can be multiple roots in the XML file. A node can be referenced
> multiple times in any given tree.
> I would like to write a stylesheet which gets as parameter a nodename
> of a rootnode, and which spits out an XML file containing all nodes
> referenced by the tree, but, and here's the catch: only once for each
> node.
> Thus, the transformation should remove root2 from the XML file above
> if $rootnode is set to root1.
> Following the tree and spitting out all nodes in that tree is easy:
> <?xml version="1.0" encoding="utf-8"?>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>                 version="1.0">
>   <xsl:output method="xml"
>     indent="yes"/>
>   <xsl:param name="rootnode"/>
>   <xsl:template match="/">
>     <xsl:apply-templates/>
>   </xsl:template>
>   <xsl:template match="document">
>     <document>
>       <xsl:apply-templates select="node[@name = $rootnode]" 
> mode="follow"/>
>     </document>
>   </xsl:template>
>   <xsl:template match="node" mode="follow">
>     <xsl:apply-templates select="."/>
>     <xsl:apply-templates 
> select="//node[@name=current()/subnode/@name]" mode="follow"/>
>   </xsl:template>
>   <!-- identity transformation -->
>   <xsl:template match="@*|node()">
>     <xsl:copy>
>       <xsl:apply-templates select="@*|node()"/>
>     </xsl:copy>
>   </xsl:template>
> </xsl:stylesheet>
> But this will spit out nodes as often as they apear in the tree. Does
> anybody see a way around this?
> The only solution I can think of (in pure XSLT) would need two
> transformations: the first would write an intermediate file with a
> list of nodenames which have to appear in the final document (with
> duplicates) and a second one, which would remove the duplicates and
> write the real output file.
> Is there a way to do it in one transformation?
> Regards, kga
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list


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