> You don't conditionally want to assign a variable, you want to
> definitely assign a variable, to a value that depends on a condition.
> So the more natural (and legal) way is
>
> <xsl:variable name="valueField"
select="@valueField|@field[not(@valueField)]"/>

Don't you really mean:

   <xsl:variable name="valueField"
   select="@valueField|@field[not(../@valueField)]"/>

?

Dave


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