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Re: strong typed variable with restriction ?

Subject: Re: strong typed variable with restriction ?
From: Andrew Welch <andrew.j.welch@xxxxxxxxx>
Date: Wed, 2 Feb 2011 10:39:07 +0000
Re:  strong typed variable with restriction ?
On 2 February 2011 10:16, Matthieu Ricaud-Dussarget
<matthieu.ricaud@xxxxxxxxx> wrote:
> 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
> "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

You get the error because you must have an xsl:otherwise, you can't
just have xsl:whens.

Regarding the 'foo' 'bar' part, it depends what you want to happen -
you could add an otherwise and terminate the transform, you could log
the error and return some non-displayed helpful element (such as
<error reason='blah'/>), or you could use a schema-aware transform and
create a custom type for the $foobar value (which would also cause the
transform to fail)

Ultimately you might be better off restructuring the calling code, as
that may be able to call the right method itself.

Andrew Welch

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