There are various ways of getting a string with quotation marks (I
believe the faq for this list has a section on that) but
element-available takes an element name and tells you if that element is
available as an extension function for use in the stylesheet. So the
argument req:parameter[(_at_)name='additional_group'] would be an error
irrespective of quoting.
Given that you use it in a selct-of it appears to be an Xpath to a node
in the source, I suspect that what you want is
<xsl:if test="req:parameter[(_at_)name='additional_group']" >...
David
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