function-available() problem while using Saxon

Hello all,
One last question for the day hopefully.

I deciding since I might be using FOP(which uses
Xalan) and at some points be using Saxon to see whats
wrong in my .fo output, that I would see which
extension function is available and use it
accordingly.
Xalan checks to see if saxon:evaluate-node is
available 1st and fails. Then dyn:evaluate is
available and correctly used.

In Saxon, it checks to see if saxon:evaluate-node is
available and FAILS?, then I believe tries to USE
dyn:evaluate and errors? It shouldn't even get to the
point of using dyn:evaluate since it isn't available
right? (i am prob doing something very wrong). I
should mention I do put saxon: and dyn: namespaces in
the top of the xsl I am using, so thats not the
problem.

XP0003: XPath syntax error at char 18 on line 200 in
{dyn:evaluate($exp)}:
  Cannot find a matching 1-argument function named
{http://exslt.org/dynamic}evaluate()


###part that selects what function to use
<xsl:choose>
  <xsl:when
test="function-available('saxon:evaluate-node')"><xsl:for-each
select="document(@href)/Document">
<xsl:apply-templates
select="saxon:evaluate-node($exp)"/>
</xsl:for-each></xsl:when>
  <xsl:when
test="function-available('dyn:evaluate')"><xsl:for-each
select="document(@href)/Document">
<xsl:apply-templates select="dyn:evaluate($exp)"/>
</xsl:for-each></xsl:when>
  <xsl:otherwise><xsl:message>EXSLT:EVALUATE() OR
SAXON:EVALUATE-NODE() NOT FOUND IN YOUR XSL
PROCESSOR</xsl:message></xsl:otherwise>
</xsl:choose>


Thanx again to the xsl list and Michael Kay


Unrelated Note if someone notices I could use a
simpler template for Saxon: I dont use that simple
template like below because if Xalan is being used, it
will not like the 'function call as a step in the
xpath' as it parses beforehand, so i keep it as is.
<xsl:apply-templates
select="document(@href)/Document/saxon:evaluate-node(current()/@nodes))"/>



		
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