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[xsl] evaluate() error variable has not been declared??

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<newbie/>
I had expected saxon:evaluate() to be simple but it has me stumped.

Why does the following test give error suggesting "Variable $test has not
been declared", when it obviously has?

<?xml version="1.0" encoding="utf-8"?>
<test>
<input>result</input>
<result>expected output!</result>
</test>

<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0" xmlns:saxon="http://saxon.sf.net/"
extension-element-prefixes="saxon">
<xsl:output method="xml" indent="no" encoding="utf-8"/>

<xsl:template match="/">
 <xsl:variable name="test" select="/test/input/text()"/>
 <xsl:value-of select="$test"/>
 <xsl:if test="$test != ''">
  <xsl:variable name="output"
select="saxon:evaluate('/test/$test/text()')"/>
  <xsl:value-of select="$output"/>
  <trace/>
 </xsl:if>
</xsl:template>

<xsl:template match="text()|@*"/>
</xsl:transform>

Without the <if>, $test has been defined and is output ok.

Regards
davidpbrown

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