Template "return value" (was: tail-end recursion)

A minor point:  templates (invoked by call-template) can return a
value, sort of.  For example, I use:

      <xsl:attribute name="descriptionString"><xsl:call-template
name="CreateProcessDescString" /></xsl:attribute>

The CreateProcessDescString named template "outputs" the various pieces of
the string; the don't really go to the output tree, but instead are
"returned" from the template call and become the value of the
descriptionString attribute.

> imho optimizing tail-end recursion is _very_ significant,
> given that variables are "final" and there is no "return value"
> from templates.
> 


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