<complexType name="AbstractTimeReferenceSystemType" abstract="true">
<annotation>
<documentation xml:lang="en">A value in the time domain is measured relative to a temporal reference system. Common
types of reference systems include calendars, ordinal temporal reference systems, and
temporal coordinate systems (time elapsed since some epoch, e.g. UNIX time).</documentation>
</annotation>
<complexContent>
<extension base="gml:DefinitionType">
<sequence>
<element name="domainOfValidity" type="string" minOccurs="0" />
</sequence>
</extension>
</complexContent>
</complexType>
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