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RE: xsi:type handling

  • To: Michael Kay <mike@s...>
  • Subject: RE: xsi:type handling
  • From: Yves Langisch <lists@l...>
  • Date: Mon, 23 May 2005 10:57:35 +0200
  • Cc: xml-dev@l...
  • In-reply-to: <20050523084121.C5B5751BCC@m...>
  • References: <20050523084121.C5B5751BCC@m...>

xs short
Michael,

Thanks for your highly appreciated answer!

Yves

On Mon, 2005-05-23 at 09:40 +0100, Michael Kay wrote:
> If you declare an element to be of type MyDerivedFromShortType, then you can
> use xsi:type to further restrict it to a subtype of MyDerivedFromShortType,
> but you can't relax the restrictions by making it an xs:short.
> 
> I wouldn't personally derive a restricted integer value from short, unless
> you have some reasons I don't know about. The type you've defined could just
> as validly be derived from xs:byte, or xs:unsignedInt, or
> xs:nonNegativeInteger. If there are no structural semantics (like
> "pass-grade" being derived from "grade") I prefer to derive such types
> directly from xs:integer. So long as you're only doing validation it doesn't
> really matter, but once you start using typed values in your application it
> makes a difference.
> 
> Michael Kay
> http://www.saxonica.com/ 
> 
> > -----Original Message-----
> > From: Yves Langisch [mailto:lists@l...] 
> > Sent: 23 May 2005 09:19
> > To: xml-dev@l...
> > Subject:  xsi:type handling
> > 
> > All,
> > 
> > I have a derived type from short in my schema such as:
> > 
> >      <xs:simpleType name="MyDerivedFromShortType">
> >          <xs:restriction base="xs:short">
> >              <xs:minInclusive value="1"/>
> >              <xs:maxInclusive value="100"/>
> >          </xs:restriction>
> >      </xs:simpleType>
> > 
> > My question now is, if following line in a instance document is valid?
> > 
> >         <ns2:MyDerivedFromShort
> > xsi:type="xsd:short">99</ns2:MyDerivedFromShort>
> > 
> > When parsing this with Xerces it will throw
> > 
> > Validation error: LineNumber: 48 ColumnNumber: 2883 Message: 
> > cvc-elt.4.3: Type 'xsd:short' is not validly derived from the type 
> > definition, 'MyDerivedFromShortType', of element
> > 'ns2:MyDerivedFromShort'.:
> > 
> > Can someone confirm that Xerces' behaviour is reasonable?
> > 
> > Thanks
> > Yves
> > 
> > 
> > 
> > 
> > -----------------------------------------------------------------
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> > 
> 
> 
> 


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