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[xsl] strong typed variable with restriction ?

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Hi all,

I have a xsl:function which :
- must return a element()
- has a string param "foobar".

I typed $foobar as xs:string but I'd like to restrict the possible values to "foo" or "bar".
I know it's possible to define such a constrain in a xsd schema, but is there a way to do that in xpath2 ?

This typing is important because the returned element() is selected from a xsl:choose on $foobar value (with no otherwise) :

My code looks like :
<xsl:function name="igs:get-css-rule" as="element()">
<xsl:param name="foobar" as="xs:string"/> <!--(foo|bar)-->
<xsl:choose>
<xsl:when test="$foobar='foo'">
<xsl:sequence select="igs:get-my-foo-item()"/>
</xsl:when>
<xsl:when test="$css='bar'">
<xsl:sequence select="igs:get-my-bar-item()"/>
</xsl:when>
</xsl:choose>
</xsl:function>

And I get such a parsing error on my xslt :
XTTE0570: Conditional expression: If none of the conditions is satisfied, an empty
sequence will be returned, but this is not allowed [...]

Should I import my own schema to my xsl to define my special type derived from xs:string ?

Thanks for your advices,

Matthieu.

--
Matthieu Ricaud
IGS-CP
Service Livre numirique

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