<xs:simpleType name="MD_TopicCategoryCode_Type">
    <xs:annotation>
        <xs:documentation>High-level geospatial data thematic classification to assist in the grouping and search of available geospatial datasets</xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
        <xs:enumeration value="farming" />
        <xs:enumeration value="biota" />
        <xs:enumeration value="boundaries" />
        <xs:enumeration value="climatologyMeteorologyAtmosphere" />
        <xs:enumeration value="economy" />
        <xs:enumeration value="elevation" />
        <xs:enumeration value="environment" />
        <xs:enumeration value="geoscientificInformation" />
        <xs:enumeration value="health" />
        <xs:enumeration value="imageryBaseMapsEarthCover" />
        <xs:enumeration value="intelligenceMilitary" />
        <xs:enumeration value="inlandWaters" />
        <xs:enumeration value="location" />
        <xs:enumeration value="oceans" />
        <xs:enumeration value="planningCadastre" />
        <xs:enumeration value="society" />
        <xs:enumeration value="structure" />
        <xs:enumeration value="transportation" />
        <xs:enumeration value="utilitiesCommunication" />
    </xs:restriction>
</xs:simpleType>

• MD_TopicCategoryCode_Type
• gmd:MD_TopicCategoryCode