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Re: Attribute Fixed and Prohibited

From: Stanley Guan <stanley.guan@oracle.com>
Date: Thu, 28 Mar 2002 17:21:37 -0800
Message-ID: <3CA3C1A1.2B45D926@oracle.com>
To: xmlschema-dev@w3.org
 Jeni,

Is the following a valid attribute declaration?
  <xs:attribute name="domain" type="xs:positiveInteger" use="prohibited"
   fixed="123"/>
If not, where does it state that in the spec.?

Thx,

-Stanley

> Re: Attribute Fixed and Prohibited
>
> From: Jeni Tennison (jeni@jenitennison.com)
> Date: Wed, Mar 27 2002
>
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> Date: Wed, 27 Mar 2002 13:23:48 +0000
> From: Jeni Tennison <jeni@jenitennison.com>
> Message-ID: <130400635723.20020327132348@jenitennison.com>
> To: Joey <lpjcoyle@ihc.com>
> CC: xmlschema-dev@w3.org
> Subject: Re: Attribute Fixed and Prohibited
>
> Hi Joey,
>
> > I want an attribute to have a fixed value that is available to the
> > schema processor, but not allow the attribute in instances. Is the
> > following valid, and does it do what I want.
> >
> > <xs:attribute name="domain" type="xs:positiveInteger" use="prohibited"
> > fixed="123"/>
>
> The use="prohibited" attribute is a way of removing attribute uses
> from the set of attributes for a complex type when you derive by
> restriction. It bans the attribute from appearing in the instance, but
> it also means that the attribute isn't present in the PSVI, so you
> won't have access to the fixed value at all.
>
> I don't think that there is a way of doing what you describe. I guess
> that you could say that the attribute is optional (the default), with
> a fixed value:
>
>   <xs:attribute name="domain" type="xs:positiveInteger" fixed="123"/>
>
> And then have a Schematron rule that tests whether it's actually
> present:
>
>   <sch:report test="@domain">
>     The domain attribute should not be present.
>   </sch:report>
>
> This will only work if you're using Schematron with XSLT 1.0; come
> XSLT 2.0, XSLT will work over the PSVI, so won't be able to tell the
> difference between an attribute that's actually present in the
> document and one that's been fixed or defaulted in the schema.
>
> Out of interest, why do you want to do this, and how are you intending
> that the fixed attribute be used by applications? If you want to
> provide a kind of "annotation" about an element, I suggest that you
> use xs:appinfo instead:
>
>   <xs:appinfo>
>     <my:domain>123</my:domain>
>   </xs:appinfo>
>
> Applications with access to the PSVI should get access to the content
> of xs:appinfo in order to get this value; since it's not declared as
> an attribute, there's no risk of it appearing in the instance
> document.
>
> Cheers,
>
> Jeni
>
> ---
> Jeni Tennison
> http://www.jenitennison.com/
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>    * Next message: Andy Del Rio: "RE: ID & IDREF Schema Confusion"
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>    * In reply to: Joey: "Attribute Fixed and Prohibited"
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Received on Thursday, 28 March 2002 20:21:40 GMT

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