<xs:attributeGroup name="PositionGroup">
    <xs:annotation>
        <xs:documentation xml:lang="en">Used to specify the geographic coordinates of a location.</xs:documentation>
    </xs:annotation>
    <xs:attribute name="Latitude" type="StringLength1to16" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">The measure of the angular distance on a meridian north or south of the equator.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="Longitude" type="StringLength1to16" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">The measure of the angular distance on a meridian east or west of the prime meridian.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="Altitude" type="StringLength1to16" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">The height of an item, typically above sea level.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="AltitudeUnitOfMeasureCode" type="OTA_CodeType" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">Provides the unit of measure for the altitude (e.g., feet, meters, miles, kilometers). Refer to OTA Code List Unit of Measure Code (UOM).</xs:documentation>
        </xs:annotation>
    </xs:attribute>
</xs:attributeGroup>