Is it possible to have multiple substitution groups for each element type?

Question

Say that the circuit has the following:

    <xsd:complexType name="shape"/>

    <xsd:complexType name="circle">
            <xsd:complexContent>
                <xsd:extension base="shape">
                    <xsd:attribute name="radius" type="xsd:double"/>
                </xsd:extension>
            </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="arc">
                <xsd:complexContent>
                    <xsd:extension base="circle">
                        <xsd:attribute name="startAngle" type="xsd:double"/>
                        <xsd:attribute name="endAngle" type="xsd:double"/>
                    </xsd:extension>
                </xsd:complexContent>
    </xsd:complexType>

Then you can add a lookup group such as

<xsd:element name="shape" type="shape" abstract="true"/>
<xsd:element name="circle" type="circle" substitutionGroup="shape"/>
<xsd:element name="arc" type="arc" substitutionGroup="shape"/>

and then take any of these types, referring to the group, for example:

<xsd:element ref="shape"/>

This part is not a problem.

But what if I also want to be able to resolve (in another section) just a circle and its subtype?

Can I add multiple substitution groups to emulate the correct inheritance in the schema? I tried to add another type of element, for example:

<xsd:element name="shape" type="shape" abstract="true"/>
<xsd:element name="circle" type="circle" substitutionGroup="shape"/>
<xsd:element name="arc" type="arc" substitutionGroup="shape"/>
<xsd:element name="arc2" type="arc" substitutionGroup="circle"/>

But I better not change the name of the expected element depending on what I expect.

Is there a better way to do this?

Answer 1

arc circle. shape, circle arc, circle, circle, arc.