Re: [xml-dev] Style, Substance and Typing in Schemas

[Chris Simmons <cps@corefiling.com>]

On 11/10/11 15:29, Toby Considine wrote:

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I have a question of Style and Substance in XSD

 

I have a number of top-level elements that are variants of one another. Each of these appears in multiple Types (worthy of top-lelvelness).

 

Let’s say we have uid as a simple base type.

 

<xs:element name="uid" type="UidType"/>

<xs:simpleType name="UidType">

                <xs:annotation>

                                <xs:documentation>Unique Identifier</xs:documentation>

                </xs:annotation>

                <xs:restriction base="xs:string"/>

</xs:simpleType>

To dirty the waters further, you forgot option C:-

<xs:element name="fooID" substitutionGroup="uid"/>

Perhaps which you choose is a pragmatic one based on how the schema type system is mapped onto your other type system in whatever code base you're using.

Its not clear that there is one such mapping though which is perhaps the point you're trying to make.  Do substitution groups map onto the type system?  Or do you ignore that and use the element's schema-type?

Chris Simmons.