> Gestalt doesn't allow extension functions to have side effects though,
> so I will put this on my todo list.

But what about xslt-defined functions that have side effects? 

<xsl:function name="my:f">
<xsl:param name="x">
<xsl:result-document...
   <xsl;apply-templates ...

...

<xsl:for-each select="my:f(.)"/>




> Presumably a similar warning for xsl:template and xsl:for-each-group
> would be equally desirable. Any others?


not xsl:template:-)

<xsl:template match="/"/> typically does have an effect.


David

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