<xs:attribute ref="name" use="required"/>
<xs:attribute ref="width" use="required"/>
<xs:attribute ref="type"/>
- <xs:attribute ref="level"/>
<xs:attribute ref="purpose"/>
<xs:attribute ref="multiplicity"/>
</xs:attributeGroup>
<xs:attribute name="core" type="xs:string"/>
<xs:attribute name="wishbone" type="xs:string"/>
<xs:attribute name="context" type="xs:string" />
- <xs:attribute name="level" type="xs:string" />
<xs:attribute name="multiplicity" type="xs:string" />
<xs:attribute name="width" type="xs:string"/>
<xs:attribute name="purpose" type="xs:string"/>