<complexType name="VerticalDatumType">
<annotation>
<documentation>A textual description and/or a set of parameters identifying a particular reference level surface used as a zero-height surface, including its position and orientation with respect to the Earth for any of the height types recognized by this standard. </documentation>
</annotation>
<complexContent>
<extension base="gml:AbstractDatumType">
<sequence>
<element ref="gml:verticalDatumType" minOccurs="0" />
</sequence>
</extension>
</complexContent>
</complexType>
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