<complexType name="AbstractReferenceSystemType" abstract="true">
<annotation>
<documentation>Description of a spatial and/or temporal reference system used by a dataset. </documentation>
</annotation>
<complexContent>
<extension base="gml:AbstractReferenceSystemBaseType">
<sequence>
<element ref="gml:srsID" minOccurs="0" maxOccurs="unbounded">
<annotation>
<documentation>Set of alterative identifications of this reference system. The first srsID, if any, is normally the primary identification code, and any others are aliases. </documentation>
</annotation>
</element>
<element ref="gml:remarks" minOccurs="0">
<annotation>
<documentation>Comments on or information about this reference system, including source information. </documentation>
</annotation>
</element>
<element ref="gml:validArea" minOccurs="0" />
<element ref="gml:scope" minOccurs="0" />
</sequence>
</extension>
</complexContent>
</complexType>
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