<xsl:template match="foo/@bar[. = 'xxx']">
  <xsl:attribute name="bar">yyy</xsl:attribute>
</xsl:template>

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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