XML Schema restriction contradiction?

From: Lyndon J B Nixon <nixon@f...>
To: xml-dev@l...
Date: Tue, 13 Mar 2001 16:53:55 +0100

Play the video

hi,

is the current definition of <restriction> in the XML Schema CR 24/10/2001 contradictory or am i missing something?

in Part 1:Structures Appendix A: Schema for XML Schemas (normative)

<complexType name="restrictionType">
<complexContent>

</choice>

</sequence>

<attribute name="base" type="QName" use="required"/>

        </extension>
        </complexContent>
</complexType>

This seems to conform to the Schema validation that I am using (XML Spy 3.5) which returns an error that the base attribute is required when i use a XML Schema containing restrictions without a base but with a simpleType child.

However in Part 2:Datatypes section 5.1.1

"Either the base [attribute] or the simpleType [child] must be present, but not both."

which matches with the given Schema for Datatype Definitions which states

<element name="restriction" substitutionGroup="simpleDerivation" id="restriction">
        <complexType>

base attribute and simpleType child are mutually exclusive, but one or other is required

</documentation>

</annotation>

<attribute name="base" type="QName" use="optional"/>

</extension>

        </complexContent>
        </complexType>
</element>

So, is the base attribute optional or required? Is the XML Spy validator correctly validating my XML Schema?
The offending (error producing) XML Schema code is:

<simpleType name="SFColor">
      <restriction>
         <simpleType>
            <list itemType="xmta:ZeroToOneFloat"/>
         </simpleType>
         <length value="3"/>
      </restriction>
   </simpleType>

regards

lyndon

Lyndon J B Nixon ... MAGIC Centre, GMD FOKUS ... Berlin, Germany
"what is now proved was once only imagined" - william blake
PhD Student, Integration of Internet into MPEG-4 & MPEG-7
nixon@f... members.tripod.co.uk/~madeejit/phd.htm

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