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<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:external="http://ExternalFunction.xalan-c++.xml.apache.org"
exclude-result-prefixes="external">
<xsl:template match="area">
<xsl:choose>
<xsl:when test="function-available('external:square-root') and function-available('external:cube')">
<given>
The area of each face of the cube is <xsl:value-of select="@value"/>
<xsl:text> square units </xsl:text> <xsl:value-of select="@units"/>.
</given>
<result>
Accordingly, the length of each side is <xsl:value-of select="external:square-root(@value)"/>
<xsl:text> </xsl:text><xsl:value-of select="@units"/> and the volume of the cube is
<xsl:value-of select="external:cube(external:square-root(@value))"/>
<xsl:text> cubic </xsl:text> <xsl:value-of select="@units"/>.
</result>
</xsl:when>
<xsl:otherwise>
<result>
The functions external:square-root() and external cube() are not available!
</result>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="now">
<xsl:choose>
<xsl:when test="function-available('external:asctime')">
<when>
Date and time when we figured all this out: <xsl:value-of select="external:asctime()"/>.
</when>
</xsl:when>
<xsl:otherwise>
<result>
The function external:asctime() is not available!
</result>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
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