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schema dialect conversion

• From: Nick Laqua <nick.laqua@n...>
• To: xml-dev@l..., "'castor-dev@e...'" <castor-dev@e...>
• Date: Tue, 13 Mar 2001 19:53:08 +0100

-----Original Message-----
From: Lyndon J B Nixon [mailto:nixon@f...]
Sent: Tuesday, March 13, 2001 4:54 PM
To: xml-dev@l...
Subject: XML Schema restriction contradiction?

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>
                <extension base="annotated">
                        <sequence>
                                <choice>
                                        <group ref="typeDefParticle" minOccurs="0"/>
                                        <group ref="simpleRestrictionModel" minOccurs="0"/>
                                </choice>
                        <group ref="attrDecls"/>
                        </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>
                <annotation>
                        <documentation xml:lang="en" source="http://www.w3.org/TR/xmlschema-2/#element-restriction">
                        base attribute and simpleType child are mutually exclusive, but one or other is required
                                </documentation>
                </annotation>
                <complexContent>
                        <extension base="annotated">
                                <group ref="simpleRestrictionModel"/>
                                <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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