<xsl:function name="pref:myId" as="xs:string">
 <xsl:variable name="myNode" as="element()">
   <someNode/>
 </xsl:variable>

 <xsl:variable name="vdynNode" as="element()">
  <xsl:copy-of select="$myNode"/>
 </xsl:variable>

<xsl:sequence select="generate-id($vdynNode)"/>

<xsl:function


surely you can lose the first variable and write that as

<xsl:function name="pref:myId" as="xs:string">
 <xsl:variable name="myNode" as="element()">
   <someNode/>
 </xsl:variable>

<xsl:sequence select="generate-id($myNode)"/>

<xsl:function

I think in this case generate-id() will be applied on the same node
again and again and will return the same string -- this is why I want
always to have a new copy of it -- or am I wrong?

--
Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
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To invent, you need a good imagination and a pile of junk
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You've achieved success in your field when you don't know whether what
you're doing is work or play