xsl:for-each...iteration question

This has been answered before I'm sure but doing a relevant search in the 
archives is tricky.
 
I've an input doc containing a number of modify-attr elements
<modify>
  <modify-attr attr-name = "abc"/> 
  <modify-attr attr-name = "123"/>
  <modify-attr attr-name = "789"/>
</modify>
 
I have another document containing a list of prohibited attributes.
<exclude-list>
  <exclude-attr>123</exclude-attr>
</exclude-list>
 
 
I want to iterate over my input doc and copy all those modify-attr elements 
that are NOT in the exclude list to the output.
 
<xsl:template match="modify/modify-attr">
  <xsl:variable name="currentAttr" select="@attr-name"/>
  <xsl:variable name="currentNode" select="."/>
 
  <xsl:for-each select="document('excludedoc')/exclude-list/exclude-attr">
    <xsl:when test="$currentAttr=.">
      <xsl:message>Exclude</xsl:message>
    </xsl:when>
    <xsl:otherwise>
      <xsl:copy-of select="$currentNode"/>
    </xsl:otherwise>
  </xsl:for-each>
 
</xsl:template>
 
Obvisouly, this is flawed, I get multiple modify-attr elements copied to the 
output because I cannot see a way of ensuring the for-each only copies a 
permitted node once and once only.
 
I've a feeling this is approaching the problem from the wrong way....
 
 
 


--~------------------------------------------------------------------
XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail: <mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--