Excellent stuff! You're right, it is much faster. It eliminates the variable 
condition, and node-set conversion. And since both node-sets are mutually 
exclusive, using | wouldn't (and shouldn't) give me a problem. In fact, now 
that I think about it, that statment can be reduced to



<xsl:variable name="validAttributeType" select="
          (key('allTypes', @type) | xsd:simpleType)/xsd:restriction"/>

Thank you Mukul, Michael, and David for your help and insight!



----Original Message Follows----



glad you got it working although  actually you could avoid copying the
original nodes into a result-ree fragent, and just define the variable
to reference the original nodes directly, which avoids using xx:node-set
and is more efficient.

      <xsl:variable name="validAttributeType" select="

          ( key('allTypes', @type)|xsd:simpleType[not(key('allTypes', 
@type))])/xsd:restriction"/>



David



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