The 'enumeration' element specifies an exact value.
You can have more than one of these to specify different values.
The enumeration value must be an instance of the base type.
A status keyword enumeration:
<xs:simpleType name="Status"> <xs:restriction base="xs:string"> <xs:enumeration value="draft"/> <xs:enumeration value="last call"/> <xs:enumeration value="proposed recomendation"/> <xs:enumeration value="unknown"/> </xs:restriction> </xs:simpleType>