gml:SequenceRuleEnumeration

<simpleType name="SequenceRuleEnumeration">
  <restriction base="string">
    <enumeration value="Linear"/>
    <enumeration value="Boustrophedonic"/>
    <enumeration value="Cantor-diagonal"/>
    <enumeration value="Spiral"/>
    <enumeration value="Morton"/>
    <enumeration value="Hilbert"/>
  </restriction>
</simpleType>