<union
id=ID
memberTypes="list of QNames"
any attributes
>

(annotation?,(simpleType*))

</union>

<xs:element name="jeans_size">
??<xs:simpleType>
????<xs:union memberTypes="sizebyno sizebystring" />
??</xs:simpleType>
</xs:element>

<xs:simpleType name="sizebyno">
??<xs:restriction base="xs:positiveInteger">
????<xs:maxInclusive value="42"/>
??</xs:restriction>
</xs:simpleType>

<xs:simpleType name="sizebystring">
??<xs:restriction base="xs:string">
????<xs:enumeration value="small"/>
????<xs:enumeration value="medium"/>
????<xs:enumeration value="large"/>
??</xs:restriction>
</xs:simpleType>