Getting Xerces to accept copy-of parameters

[Patrik Carlsson]

I have a problem using Xerces with a template for
a generic page-header getting a sub-tree as argument.
The same stylesheet is working flawlessly in IE and
Mozilla, though it would be nice to have a result-file
to work with too.

Here is an example (xerces only get a collapsed string through), any suggestions or current bug-reports are welcome.

/ Patrik

My "paramtest.xml" :

<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="sendparam.xsl"?> <rootnode> <treenode> <organization>The Apache Software Foundation</organization> <street>1901 Munsey Drive</street> <address>Forest Hill, MD 21050-2747</address> <country>U.S.A</country> </treenode> <othernode> othernode </othernode> </rootnode>

The stylesheet "sendparam.xsl" sending a node as parameter :

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xslutput method="xml" indent="yes" doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" encoding="ISO-8859-1" />

<xsl:include href="getparam.xsl"/>

<xsl:template match="rootnode">

<xsl:variable name="treecopy">
<xsl:copy-of select="treenode"/>
</xsl:variable>

<xsl:call-template name="testtemplate">
<xsl:with-param name="paramtree" select="$treecopy"/>
</xsl:call-template>

</xsl:template>
</xsl:stylesheet>

A generic stylesheet "getparam.xsl" using the parameter :

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xslutput method="xml" indent="yes" encoding="ISO-8859-1" />

<xsl:template name="testtemplate">
<xslaram name="paramtree">no recipent</xslaram>
<xsl:for-each select="$paramtree/treenode/*">
<b>
<xsl:value-of select="."/>
</b>
<br/>
</xsl:for-each>
</xsl:template>

</xsl:stylesheet>

 

[Dave Bertoni]

I have a problem using Xerces with a template for
a generic page-header getting a sub-tree as argument.
The same stylesheet is working flawlessly in IE and
Mozilla, though it would be nice to have a result-file
to work with too.

Here is an example (xerces only get a collapsed string through), any suggestions or current bug-reports are welcome.

/ Patrik

You do mean you're using Xalan, right? Xerces is an XML parser, not an XSLT processor.

....

The stylesheet "sendparam.xsl" sending a node as parameter :

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xslutput method="xml" indent="yes" doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" encoding="ISO-8859-1" />

<xsl:include href="getparam.xsl"/>

<xsl:template match="rootnode">

<xsl:variable name="treecopy">
<xsl:copy-of select="treenode"/>
</xsl:variable>

....

This variable is a result tree fragment, which has limitations in XSLT
1.0.

<xsl:call-template name="testtemplate">
<xsl:with-param name="paramtree" select="$treecopy"/>
</xsl:call-template>

</xsl:template>
</xsl:stylesheet>

A generic stylesheet "getparam.xsl" using the parameter :

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xslutput method="xml" indent="yes" encoding="ISO-8859-1" />

<xsl:template name="testtemplate">
<xslaram name="paramtree">no recipent</xslaram>
<xsl:for-each select="$paramtree/treenode/*">
<b>
<xsl:value-of select="."/>
</b>
<br/>
</xsl:for-each>
</xsl:template>

</xsl:stylesheet>

You are trying to use a result tree fragment as a node-set, which is not allowed in XSLT 1.0. MSXSL 3.0 allows this, but 4.0 does not. I don't know why Mozilla allows this, but that's a bug. Xalan is correctly rejecting your stylesheet.

One way around this is to use a processor-specific extension to convert a result tree fragment. Another choice is to use the EXSLT node-set extension, which is more portable.

Dave

 

[Patrik Carlsson]

See the old post...

You are trying to use a result tree fragment as a node-set, which is not allowed in XSLT 1.0. MSXSL 3.0 allows this, but 4.0 does not. I don't know why Mozilla allows this, but that's a bug. Xalan is correctly rejecting your stylesheet.

One way around this is to use a processor-specific extension to convert a result tree fragment. Another choice is to use the EXSLT node-set extension, which is more portable.

Dave

Thank's for the help,
Knowing the difference between node-sets and tree-fragments helped a lot. Since my application was simple just sending the node without using a variable solved my problem:

<xsl:with-param name="paramtree" select="/rootnode/treenode"/>

Then the parameter can be traversed as I wished

<xsl:for-each select="$paramtree/*">
<b><xsl:value-of select="."/></b><br/>
</xsl:for-each>

Cheers
Patrik