For example, if the function returns
the integer 5 then:
"$value instance of xs:integer"
should yield true
That will be true automatically: you don't have to declare it.
Values always have some type and instance of will check that type
(at run time).
<xsl:value-of select="$num"/>
value-of always generates a text node with string value the
serialisation of the value supplied, so you will always lose type
information that way.
You want xsl:sequence if you want to return values other than text.
<xsl:function name="ex:Test">
<xsl:param name="letter"/>
<xsl:choose>
<xsl:when test="$letter eq 'A'">
<xsl:sequence select="5""/>
</xsl:when>
<xsl:when test="$letter eq 'B'">
<xsl:sequence select="xsd:decimal(5.0)""/>
</xsl:when>
...
<xsl:otherwise>
<xsl:value-of select="'Error'"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
David
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