<element name="exterior" type="gml:SurfacePropertyType" minOccurs="0">
<annotation>
<appinfo>
<sch:pattern xmlns:sch="http://www.ascc.net/xml/schematron">
<sch:rule context="gml:exterior">
<sch:extends rule="hrefOrContent" />
</sch:rule>
</sch:pattern>
</appinfo>
<documentation>Boundaries of solids are similar to surface boundaries. In normal 3-dimensional Euclidean space, one (composite) surface is distinguished as the exterior. In the more general case, this is not always possible.</documentation>
</annotation>
</element>
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