As Michael just said ypu can't rely on order of evaluation of and.
Also it's probably more natural to invert the pattern and write it as
a//b rather than b[ancestor::a] (even though they mean teh same thing)
It's probably just easiest to allow your function to return an empty
sequence by adding the * as below.
David
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="2.0"
xmlns:page="p"
xmlns:xs="http://www.w3.org/2001/XMLSchema";
<xsl:function name="page:field" as="element()*">
<xsl:param name="name" as="xs:string"/>
<xsl:sequence select="document('')/form/field[name = $name][1]"/>
</xsl:function>
<xsl:template
match="page:error[(_at_)name]//page:message[
page:field(ancestor::page:error/@name)/error]"
>
<page:message><xsl:value-of
select="page:field(ancestor::page:error/@name)/error"/></page:message>
</xsl:template>
</xsl:stylesheet>
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