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<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:f="http://exslt.org/functions"
extension-element-prefixes="f">
<f:function name="f:f1">
<xsl:param name="n"/>
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
<xsl:choose>
<xsl:when test="$n > 0">
<f:result select="f:f1($n - 1)"/>
</xsl:when>
<xsl:otherwise>
<f:result select="1"/>
</xsl:otherwise>
</xsl:choose>
</f:function>
<f:function name="f:f2">
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
<f:result select="1"/>
</f:function>
<f:function name="f:f3">
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
<f:result>
<xsl:number/>
</f:result>
</f:function>
<f:function name="f:f4">
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
<f:result>
<xsl:apply-templates/>
</f:result>
</f:function>
<f:function name="f:f5">
<xsl:for-each select="namespace::*">
<xsl:sort/>
</xsl:for-each>
<f:result select="key('xxx', 'yyy')"/>
</f:function>
<xsl:template match="/*">
<xsl:value-of select="f:f1(4)"/>
<xsl:value-of select="f:f2()"/>
<xsl:value-of select="f:f3()"/>
<xsl:value-of select="f:f4()"/>
<xsl:value-of select="f:f5()"/>
</xsl:template>
</xsl:stylesheet>
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