[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: strong typed variable with restriction ?

Subject: Re: strong typed variable with restriction ?
From: Matthieu Ricaud-Dussarget <matthieu.ricaud@xxxxxxxxx>
Date: Wed, 02 Feb 2011 16:59:48 +0100
Re:  strong typed variable with restriction ?
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.


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:when test="$foobar='foo'">
         <xsl:copy-of select="igs:get-my-foo-item()" />
     <xsl:when test="$foobar='bar'">
         <xsl:copy-of select="igs:get-my-bar-item()" />

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:when test="$foobar='foo'">
<xsl:sequence select="igs:get-my-foo-item()"/>
<xsl:when test="$css='bar'">
<xsl:sequence select="igs:get-my-bar-item()"/>

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 Ricaud IGS-CP Service Livre numC)rique

Matthieu Ricaud
Service Livre numC)rique

Current Thread


Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.