On 3 Sep, 16:21, Martin Honnen <mahotr...@yahoo.de> wrote:
> bar...@bluezone.no wrote:
> > if I have defined a type in a schema, can I subclass it (refine it)
> > without rewriting all of the type?
> > E.g. I have:
> >    <xs:element name="Apple" type="xs:string"/>
> >    <xs:element name="Banana" type="xs:string"/>
> >    <xs:element name="Citrus" type="xs:string"/>
> >    <xs:complexType name="MyType">
> >            <xs:sequence>
> >                    <xs:element ref="Apple"/>
> >                    <xs:element ref="Banana" minOccurs="0" maxOccurs="unbounded"/>
> >                    <xs:element ref="Citrus"/>
> >            </xs:sequence>
> >    </xs:complexType>
> > And I want a derived type (where the new thing is that there must be
> > one or more Banana):
> >    <xs:complexType name="MyDerivedType">
> >            <xs:sequence>
> >                    <xs:element ref="Apple"/>
> >                    <xs:element ref="Banana" maxOccurs="unbounded"/>
> >                    <xs:element ref="Citrus"/>
> >            </xs:sequence>
> >    </xs:complexType>
> > Can I do this without having to write Apple and Citrus in
> > MyDerivedType?
>
> You have not used any type derivation at all as with the above
> definition for MyDerivedType you have defined a new type, there is no
> relation to MyType.
> A derivation by restriction looks as follows:
>
>    <xs:complexType name="MyDerivedType">
>      <xs:complexContent>
>        <xs:restriction base="MyType">
>          <xs:sequence>
>            <xs:element ref="Apple"/>
>            <xs:element ref="Banana" maxOccurs="unbounded"/>
>            <xs:element ref="Citrus"/>
>          </xs:sequence>
>        </xs:restriction>
>      </xs:complexContent>
>    </xs:complexType>
>
> So you need to list the same elements, you can then restrict the occurance.
>
> --
>
>         Martin Honnen --- MVP XML
>        http://JavaScript.FAQTs.com/- Skjul sitert tekst -
>
> - Vis sitert tekst -

Thanks, I see. But as I cannot avoid listing the same elements as in
the "superclass", there is not a lot to gain in using xs:restriction.