[xsl] using {} brackets with xsl:result-document href (Saxon 7.4)

["malcolm macaulay" <malcolm_xslt_list@xxxxxxxxxxx>]

Can someone please explain why I need to use {} bracket in the href of 
xsl:results-document?

I'm familiar with using {} as a shortcut for writing values into output 
attributes but I'm not sure why I can't do something like:

<xsl:result-document href="string($vFilePath) ...

Saxon (7.4) gives me the following error:

"the system identifier of the principal output file is unknown"

No doubt I totally misunderstand the {} :-)

Below are some examples of xsk:result-document which have confused me.

Thanks for your help.

cheers

Malcolm

XML:

<?xml version="1.0" encoding="UTF-8"?>
<filesToMake>
	<file path="c:/temp"/>
	<file path="c:/temp/temp"/>
</filesToMake>

XSLT:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="2.0">
	<!-- -->
	<xsl:variable name="fileSep" select="system-property('file.separator')"/>
	<!-- -->
	<xsl:template match="/">
		<xsl:apply-templates/>
	</xsl:template>
	<!--

	This works..

	<xsl:template match="file">
		<xsl:variable name="vFileName" select="concat( 'file:///' , @path , 
$fileSep , 'test.xml' )"/>
		<xsl:result-document href="{$vFileName}"  >
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>
-->
	<!--

	This does not work.... Saxon says : The system identifier of the principal 
output file is unknown..

	<xsl:template match="file">
		<xsl:variable name="vFileName" select="concat( 'file:///' , @path , 
$fileSep , 'test.xml' )"/>
		<xsl:result-document href="$vFileName"  >
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>-->
	<!--

	This works..

	<xsl:template match="file">

		<xsl:result-document href="{'file:///'}{@path}{$fileSep}{'test.xml'}"  >
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>
	-->
	<!--

	This does not work.... Saxon says : The system identifier of the principal 
output file is unknown..

	<xsl:template match="file">
		<xsl:variable name="vFileName" select="concat( 'file:///' , @path , 
$fileSep , 'test.xml' )"/>
		<xsl:result-document href="string($vFileName)"  >
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>-->
	<!--

	This works...
	-->
	<xsl:template match="file">
		<xsl:result-document href="file:///{@path}\test.xml"  >
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>

	<!--

	This does not work.... Saxon says : The system identifier of the principal 
output file is unknown..

	<xsl:template match="file">
		<xsl:result-document href="concat( 'file:///' , @path , $fileSep , 
'test.xml' )">
			<x>output..</x>
		</xsl:result-document>
	</xsl:template>-->
</xsl:stylesheet>





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