[xsl] Template priority problem

[Chris Bowditch <bowditch_chris@xxxxxxxxxxx>]

I have a requirement to copy a source XML input file but adjust just a 
couple of elements in the file. I thought this would be real simple but 
I can't get it to work. I have two templates, one specific to match 
elements I want to change and a identity transform one. Here is the XSL 
I have:

<xsl:template match="field" priority="2">
	<xsl:variable name="fieldindex" select="@index"/>
	<xsl:variable name="fieldname" 
select="ancestor::dataSet/fielddefinition[$fieldindex]/@label"/>
	<field>
		<xsl:value-of select="."/>
	</field>
</xsl:template>
<xsl:template match="* | comment() | text() | processing-instruction() | 
@*" priority="1">
	<xsl:copy>
		<xsl:apply-templates select="* | comment() | text() | 
processing-instruction() | @*"/>
	</xsl:copy>
</xsl:template>

The problem is the template that matches field elements is always 
ignored, despite the higher priority! So I just get an exact copy of the 
input XML. Can someone explain why this is and offer a simple solution 
to my requirement.

Thanks,

Chris