exists function in xslt

hi,

why cant i use:

<xsl:if test="exists(/XPATH-QUERY)) = true">
  <xsl:text> </xsl:text>
</xsl:if>

xalan sais funtion not found:

XSLException Type is: XPathParserException
Message is: The function 'exists' was not found.

why is that ?
thx

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