Hi Jeffrey,
The content model of a complex type derived by extension (see {content
type} under the section "Complex Type Definition with complex content
Schema Component" [1]) consists of a sequence of the content from the base
type followed by the effective content [2] from the type you're declaring.
Given the composition rules, you've effectively declared this (which isn't
valid [3]):
<xs:complexType name="OutputColumn">
<xs:complexContent>
<xs:sequence>
<xs:all>
<xs:element name="name" type="xs:string"/>
</xs:all>
<xs:all>
<xs:element name="tolerance" type="xs:decimal"/>
</xs:all>
</xs:sequence>
</xs:complexContent>
</xs:complexType>
and not
<xs:complexType name="OutputColumn">
<xs:complexContent>
<xs:all>
<xs:element name="name" type="xs:string"/>
<xs:element name="tolerance" type="xs:decimal"/>
</xs:all>
</xs:complexContent>
</xs:complexType>
which seems to be what you wanted. You can't use type derivation to
achieve this with XML Schema 1.0, though I think XML Schema 1.1 might be
changing the rules a bit to allow it.
Thanks.
[1] http://www.w3.org/TR/xmlschema-1/#declare-type
[2] http://www.w3.org/TR/xmlschema-1/#key-exg
[3] http://www.w3.org/TR/xmlschema-1/#cos-all-limited
Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: [EMAIL PROTECTED]
E-mail: [EMAIL PROTECTED]
Jeffrey A Lage <[EMAIL PROTECTED]> wrote on 08/14/2007
12:03:53 PM:
> All,
>
> It seems to me that this should be a valid XSD:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns="http://schemas.fundevs.com/1/asgard";
> xmlns:xs="http://www.w3.org/2001/XMLSchema";
> targetNamespace="http://schemas.fundevs.com/1/asgard";
> elementFormDefault="qualified"
> attributeFormDefault="unqualified"
> id="TestSuite">
>
> <xs:complexType name="Column">
> <xs:all>
> <xs:element name="name" type="xs:string"/>
> </xs:all>
> </xs:complexType>
>
> <xs:complexType name="OutputColumn">
> <xs:complexContent>
> <xs:extension base="Column">
> <xs:all>
> <xs:element name="tolerance" type="xs:decimal"/>
> </xs:all>
> </xs:extension>
> </xs:complexContent>
> </xs:complexType>
>
> </xs:schema>
>
> But I am receiving the following error from the parser:
>
> cos-all-limited.1.2: An 'all' model group must appear in a particle
> with {min occurs} = {max occurs} = 1, and that particle must be part
> of a pair which constitutes the {content type} of a complex type
definition.
>
> Can someone explain to me why this is incorrect?
>
> Jeffrey A. Lage | Fund Development Services
>
>
> 440 Park Avenue South | 14th Floor | New York | NY | 10016 | email:
> [EMAIL PROTECTED] | office: 212.920.3527 | mobile:
> 917.536.1767
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