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RE: Proper implementation of <redefine>

define supercede
Hi Brian,

Yes, you are correct that the new definition of AddressType should supercede
the original one.  If XML Spy doesn't accept the Mail_Stop element as a
child of Address, that sounds like an implementation bug.


Priscilla Walmsley                          priscilla@w...
Vitria Technology                            http://www.vitria.com
Author, Definitive XML Schema                  (Prentice Hall PTR)

> -----Original Message-----
> From: Magick, Brian [mailto:Brian.Magick@C...]
> Sent: Friday, March 29, 2002 2:24 PM
> To: xml-dev@l...
> Subject:  Proper implementation of <redefine>
> Question regarding the usage and implementation of redefine:
> As I've read in numerous texts, and as is made clear (or as clear as
> clear can be from the W3C) in Schema Primer Part 0, the <redefine>
> element will actually "replace" the external definition of a type or
> group.  
> The redefined definition of the structure should take place 
> anywhere the
> original structure was defined as a type or group.  For example, (from
> the W3C Primer) if you redefine and extend AddressType, the new
> AddressType will occur anywhere the old AddressType was 
> declared (within
> the same namespace).  The Primer Part 0 states:  "Outside of the
> redefine element, any such attempt to define a complex type with the
> same name (and in the same namespace) as the base from which 
> it is being
> derived would cause an error. But in this case, there is no error, and
> the extended definition of Address becomes the only definition of
> Address."  The primer continues with "Now that Address has been
> redefined, the extension applies to all schema components 
> that make use
> of Address."
> This seems VERY clear to me that the new AddressType 
> supercedes the old,
> everywhere...PERIOD.
> Unfortunately, a popular XML Schema editing tool with a very 007'ish
> flair to the name, (ok, no need to protect the guilty...XML
> Spy...Version 4.3 to be exact) seems to miss the proper implementation
> of <redefine>.
> Perhaps my understanding of <redefine> is flawed, or perhaps 
> XML Spy has
> got this wrong, but when I redefine a type such as AddressType, and in
> another element in the new Schema set the type to "AddressType", it
> retains the original type definition and does not include the 
> extensions
> that I've added to AddressType.
> The following snippet of Schema displays the structure that I 
> am using:
> 	<xs:redefine schemaLocation="Address.xsd">
> 		<xs:complexType name="AddressType">
> 			<xs:complexContent>
> 				<xs:extension base="AddressType">
> 					<xs:sequence>
> 						<xs:element
> name="Mail_Stop" type="xs:string" minOccurs="0"/>
> 					</xs:sequence>
> 				</xs:extension>
> 			</xs:complexContent>
> 		</xs:complexType>
> 	</xs:redefine>
> 	<xs:element name="Address" type="AddressType"/>
> </xs:schema>
> The Address element within XML Spy does not have the Mail_Stop element
> that was just added via the <redefine> element.  
> Any suggestions as to whether I made an error or whether this is an
> apparent implementation bug?
> Brian Magick
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