<group name="ValuesUnit">
<annotation>
<documentation>Indicates that this quantity has units or a reference system, and identifies the unit or reference system used by the AllowedValues or ValuesReference. </documentation>
</annotation>
<choice>
<element ref="ows:UOM">
<annotation>
<documentation>Identifier of unit of measure of this set of values. Should be included then this set of values has units (and not a more complete reference system). </documentation>
</annotation>
</element>
<element ref="ows:ReferenceSystem">
<annotation>
<documentation>Identifier of reference system used by this set of values. Should be included then this set of values has a reference system (not just units). </documentation>
</annotation>
</element>
</choice>
</group>
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