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RE: Derivation of mixed content models 2nd

From: Anli Shundi <ashundi@tibco.com>
Date: Thu, 15 May 2003 13:28:53 -0400
Message-ID: <339902DC0E58D411986A00B0D03D843201C17E84@extmail.rtp.tibco.com>
To: "'hans meier'" <hansmeier000@yahoo.de>, xmlschema-dev@w3.org
it's an error of the validator since a value valid for the restriction
should be valid
for the base as well.  See [1]
 
[1] http://www.w3.org/TR/xmlschema-1/#key-typeRestriction
<http://www.w3.org/TR/xmlschema-1/#key-typeRestriction> 
key_typeRestriction[Definition:]  A type definition whose declarations or
facets are in a one-to-one relation with those of another specified type
definition, with each in turn restricting the possibilities of the one it
corresponds to, is said to be a restriction. The specific restrictions might
include narrowed ranges or reduced alternatives. Members of a type, A, whose
definition is a  <http://www.w3.org/TR/xmlschema-1/#key-typeRestriction>
·restriction· of the definition of another type, B, are always members of
type B as well.

 

Anli Shundi
TIBCO Software Inc.
www.tibco.com 

-----Original Message-----
From: hans meier [mailto:hansmeier000@yahoo.de]
Sent: Thursday, May 15, 2003 9:29 AM
To: xmlschema-dev@w3.org
Subject: Derivation of mixed content models 2nd


Hello,
I came across the following thread on the derivation of mixed
content models.
http://lists.w3.org/Archives/Public/xmlschema-dev/2001Oct/0113.html
<http://lists.w3.org/Archives/Public/xmlschema-dev/2001Oct/0113.html> 
If I am not misinterpreting Henry´s answer, the follwing combinations
are allowed
 
Derivation by extension
-----------------------
base type           derived type
mixed="true"       mixed="true"
mixed="false"      mixed="false"

Derivation by restriction
-------------------------
base type           derived type
mixed="true"       mixed="true"
mixed"false"        mixed="false"
mixed="true"       mixed="false"  if all element content is optional
 
so it should be an error, if there is mixed="false" in
the base type and mixed="true" in the restricted type.
 
So why do XSV 2.4 and MSXML 4.0 SP2 say, that the following is valid?
----------------------------------------------------------------------------
------
<xs:schema xmlns:xs=" http://www.w3.org/2001/XMLSchema
<http://www.w3.org/2001/XMLSchema> ">
<xs:complexType name="base" >
   <xs:sequence>
      <xs:element name="bar" type="xs:string" minOccurs="0"
maxOccurs="unbounded"/>
   </xs:sequence>
</xs:complexType>
<xs:element name="foo">
   <xs:complexType mixed="true">
      <xs:complexContent>
         <xs:restriction base="base">
            <xs:sequence>
               <xs:element name="bar" type="xs:string" minOccurs="0"
maxOccurs="unbounded"/>
            </xs:sequence>
         </xs:restriction>
      </xs:complexContent>
   </xs:complexType>
</xs:element>
</xs:schema>
----
<foo xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance
<http://www.w3.org/2001/XMLSchema-instance> "
     xsi:noNamespaceSchemaLocation="05_mixedDeriv_nm_m_r.xsd">
text
<bar/>
</foo>
----------------------------------------------------------------------------
---------
Error or misunderstanding on my side??
Please bring some light in the dark.
Thank you
Hans




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Received on Thursday, 15 May 2003 13:37:02 GMT

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