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RE: Who can implement W3C XML Schema ?


xml schema empty element
Just to be very, painfully, tediously, clear-- the following two
declarations are NOT equivalent:

<element name="myElem"/>

 <element name="myElem">
       <complexType>
               <complexContent>
                       <restriction base="anyType"/>
               </complexContent>
       </complexType>
 </element>

The first declaration is equivalent to the following:

<element name="myElem" type="anyType"/>

Which I hope makes the reason for the use of restriction for empty element
declarations a tiny bit clearer.


> -----Original Message-----
> From: Ronald Bourret [mailto:rpbourret@r...]
> Sent: Friday, March 22, 2002 1:38 PM
> To: xml-dev@l...
> Subject: Re:  Who can implement W3C XML Schema ?
> 
> 
> Oops. This was in response to Jeff Lowery's clarification of the dual
> nature of anyType in the following, and why an instance of myElem can
> only have empty content.
> 
> > <element name="myElem">
> >       <complexType>
> >               <complexContent>
> >                       <restriction base="anyType"/>
> >               </complexContent>
> >       </complexType>
> > </element>
> 
> Sorry about the confusion.
> 
> -- Ron
> 
> Ronald Bourret wrote:
> > 
> > OK. Now that I finally understand why this is invalid, what 
> is the point
> > of allowing an xsd:restriction element with no children? Is it
> > specifically to allow me to restrict content down to 
> emptiness and yet
> > still get the OO advantages (?) of using a restriction?
> 
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