<element name="baseSurface" type="gml:SurfacePropertyType">
<annotation>
<appinfo>
<sch:pattern name="Check either href or content not both" xmlns:sch="http://www.ascc.net/xml/schematron">
<sch:rule context="gml:baseSurface">
<sch:extends rule="hrefOrContent" />
</sch:rule>
</sch:pattern>
</appinfo>
<documentation>This property element either references a surface via the XLink-attributes or contains the surface element. A surface element is any element which is substitutable for "_Surface".</documentation>
</annotation>
</element>
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