<xs:complexType name="AbstractSurfaceDataType" abstract="true">
	<xs:annotation>
		<xs:documentation>Base class for textures and material. Contains only isFront-flag.</xs:documentation>
	</xs:annotation>
	<xs:complexContent>
		<xs:extension base="gml:AbstractFeatureType">
			<xs:sequence>
				<xs:element name="isFront" type="xs:boolean" default="true" minOccurs="0"/>
				<xs:element ref="_GenericApplicationPropertyOfSurfaceData" minOccurs="0" maxOccurs="unbounded"/>
			</xs:sequence>
		</xs:extension>
	</xs:complexContent>
</xs:complexType>