You already found the indentity transformation template. Then you only have 
to add templates for your special cases, e.g.:
<xsl:template match="foo/@bar[. = 'xxx']">
  <xsl:attribute name="bar">yyy</xsl:attribute>
</xsl:template>
Regards,
Joerg
alexandre bord wrote:
hello
I 'd like to write an xslt file that works on an xml file and writes 
another xml file
This xslt file is more or less an identity transformation.
   <xsl:template match=" * | @* ">
       <xsl:copy>
           <xsl:apply-templates select=" * | @* "/>
       </xsl:copy>
   </xsl:template>
But for some attributes , i'd like to change their values
<foo bar="xxx" /> ===> <foo bar="yyy"/>
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