On Wed, 19 Jan 2005 00:21:12 -0000, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
saxon:discard-document is deliberately designed to return the document being
discarded, so you can wrap it round a call of document(), or any other
reference to the document is actually being used. (It's effect isn't
immediate, it merely marks the document as being available for garbage
collection when no longer referenced).
In general, if you're not using the result of a function but still want it
called, then you should try to hoodwink the optimizer into thinking that you
are using it. If it's a Java method that returns void, call it as
<xsl:sequence select="my:call(xyz)"/>
or call it as
<xsl:if test="my:call(xyz) = -1"><a/></xsl:if>
when you know the result will never be -1.
Of course, this still doesn't guarantee any specific order of
evaluation or even if the extension function will be called only once,
or am I wrong?
Cheers,
Dimitre Novatchev
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