Re: [xsl] strong typed variable with restriction ?

[Matthieu Ricaud-Dussarget <matthieu.ricaud@xxxxxxxxx>]

Hi Mukul,

The code I sent was actually simple, a kind of "school case" so you're 
right to notice this.
But in my real case there are 4 parameters for this function, and only 
two of them need to be so restricted, not the others.

I sent a mail on this topic with my real code which is quite different.
In this code there is a mistake that I just have seen : a param and a 
variable has the same name ($css), which was not an error for the 
processor but was one from the coding point of view.

Regards,
Matthieu.

Le 02/02/2011 16:43, Mukul Gandhi a C)crit :
> Hi Matthieu,
>      I would question the use of function for this need. Since the
> input parameter has only 2 states ('foo' and 'bar'), perhaps an XSLT
> code fragment as follows should be sufficient (i.e this looks like a
> simple if-then-else kind of abstraction).
>
> <xsl:choose>
>      <xsl:when test="$foobar='foo'">
>          <xsl:copy-of select="igs:get-my-foo-item()" />
>      </xsl:when>
>      <xsl:when test="$foobar='bar'">
>          <xsl:copy-of select="igs:get-my-bar-item()" />
>      </xsl:when>
> </xsl:choose>
>
> I believe functions should normally be designed when input parameters
> have potentially numerous states (of-course there may be exceptions to
> this observation, but this appears to be commonsense module/function
> design principle to me).
>
> On Wed, Feb 2, 2011 at 3:46 PM, 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 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 numC)rique


--
Matthieu Ricaud
IGS-CP
Service Livre numC)rique