coordinatereferencesystems.xsd

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	<!-- =================================================== -->
	<element name="baseCRS" type="gml:CoordinateReferenceSystemRefType">
		<annotation>
			<documentation>Association to the coordinate reference system used by this derived CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="definedByConversion" type="gml:GeneralConversionRefType">
		<annotation>
			<documentation>Association to the coordinate conversion used to define this derived CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="ProjectedCRS" type="gml:ProjectedCRSType" substitutionGroup="gml:_GeneralDerivedCRS"/>
	<!-- =================================================== -->
	<complexType name="ProjectedCRSType">
		<annotation>
			<documentation>A 2D coordinate reference system used to approximate the shape of the earth on a planar surface, but in such a way that the distortion that is inherent to the approximation is carefully controlled and known. Distortion correction is commonly applied to calculated bearings and distances to produce values that are a close match to actual field values. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractGeneralDerivedCRSType">
				<sequence>
					<element ref="gml:usesCartesianCS"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="projectedCRSRef" type="gml:ProjectedCRSRefType"/>
	<!-- =================================================== -->
	<complexType name="ProjectedCRSRefType">
		<annotation>
			<documentation>Association to a projected coordinate reference system, either referencing or containing the definition of that reference system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:ProjectedCRS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="DerivedCRS" type="gml:DerivedCRSType" substitutionGroup="gml:_GeneralDerivedCRS"/>
	<!-- =================================================== -->
	<complexType name="DerivedCRSType">
		<annotation>
			<documentation>A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system but is not a projected coordinate reference system. This category includes coordinate reference systems derived from a projected coordinate reference system. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractGeneralDerivedCRSType">
				<sequence>
					<element ref="gml:derivedCRSType"/>
					<element ref="gml:usesCS"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="derivedCRSType" type="gml:DerivedCRSTypeType"/>
	<!-- =================================================== -->
	<complexType name="DerivedCRSTypeType">
		<annotation>
			<documentation>Type of a derived coordinate reference system. </documentation>
		</annotation>
		<simpleContent>
			<restriction base="gml:CodeType">
				<attribute name="codeSpace" type="anyURI" use="required">
					<annotation>
						<documentation>Reference to a source of information specifying the values and meanings of all the allowed string values for this DerivedCRSTypeType. </documentation>
					</annotation>
				</attribute>
			</restriction>
		</simpleContent>
	</complexType>
	<!-- =================================================== -->
	<element name="usesCS" type="gml:CoordinateSystemRefType">
		<annotation>
			<documentation>Association to the coordinate system used by this CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="derivedCRSRef" type="gml:DerivedCRSRefType"/>
	<!-- =================================================== -->
	<complexType name="DerivedCRSRefType">
		<annotation>
			<documentation>Association to a non-projected derived coordinate reference system, either referencing or containing the definition of that reference system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:DerivedCRS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="EngineeringCRS" type="gml:EngineeringCRSType" substitutionGroup="gml:_CoordinateReferenceSystem"/>
	<!-- =================================================== -->
	<complexType name="EngineeringCRSType">
		<annotation>
			<documentation>A contextually local coordinate reference system; which can be divided into two broad categories:
- earth-fixed systems applied to engineering activities on or near the surface of the earth;
- CRSs on moving platforms such as road vehicles, vessels, aircraft, or spacecraft.
For further information, see OGC Abstract Specification Topic 2. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractReferenceSystemType">
				<sequence>
					<element ref="gml:usesCS"/>
					<element ref="gml:usesEngineeringDatum"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="usesEngineeringDatum" type="gml:EngineeringDatumRefType">
		<annotation>
			<documentation>Association to the engineering datum used by this CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="engineeringCRSRef" type="gml:EngineeringCRSRefType"/>
	<!-- =================================================== -->
	<complexType name="EngineeringCRSRefType">
		<annotation>
			<documentation>Association to an engineering coordinate reference system, either referencing or containing the definition of that reference system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:EngineeringCRS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="ImageCRS" type="gml:ImageCRSType" substitutionGroup="gml:_CoordinateReferenceSystem"/>
	<!-- =================================================== -->
	<complexType name="ImageCRSType">
		<annotation>
			<documentation>An engineering coordinate reference system applied to locations in images. Image coordinate reference systems are treated as a separate sub-type because a separate user community exists for images with its own terms of reference. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractReferenceSystemType">
				<sequence>
					<choice>
						<element ref="gml:usesCartesianCS"/>
						<element ref="gml:usesObliqueCartesianCS"/>
					</choice>
					<element ref="gml:usesImageDatum"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="usesObliqueCartesianCS" type="gml:ObliqueCartesianCSRefType">
		<annotation>
			<documentation>Association to the oblique Cartesian coordinate system used by this CRS.</documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="usesImageDatum" type="gml:ImageDatumRefType">
		<annotation>
			<documentation>Association to the image datum used by this CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="imageCRSRef" type="gml:ImageCRSRefType"/>
	<!-- =================================================== -->
	<complexType name="ImageCRSRefType">
		<annotation>
			<documentation>Association to an image coordinate reference system, either referencing or containing the definition of that reference system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:ImageCRS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="TemporalCRS" type="gml:TemporalCRSType" substitutionGroup="gml:_CoordinateReferenceSystem"/>
	<!-- =================================================== -->
	<complexType name="TemporalCRSType">
		<annotation>
			<documentation>A 1D coordinate reference system used for the recording of time. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractReferenceSystemType">
				<sequence>
					<element ref="gml:usesTemporalCS"/>
					<element ref="gml:usesTemporalDatum"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="usesTemporalCS" type="gml:TemporalCSRefType">
		<annotation>
			<documentation>Association to the temporal coordinate system used by this CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="usesTemporalDatum" type="gml:TemporalDatumRefType">
		<annotation>
			<documentation>Association to the temporal datum used by this CRS. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="temporalCRSRef" type="gml:TemporalCRSRefType"/>
	<!-- =================================================== -->
	<complexType name="TemporalCRSRefType">
		<annotation>
			<documentation>Association to a temporal coordinate reference system, either referencing or containing the definition of that reference system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:TemporalCRS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
</schema>