coordinateoperations.xsd

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<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="http://www.opengis.net/gml" xmlns:gml="http://www.opengis.net/gml" xmlns="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" version="3.1.1" xml:lang="en">
	<annotation>
		<appinfo source="urn:opengis:specification:gml:schema-xsd:coordinateOperations:3.1.1"/>
		<documentation>How to encode coordinate operation definitions. Builds on referenceSystems.xsd to encode the data needed to define coordinate operations, including Transformations, Conversions, and other specific subtypes of operations. 
		Copyright (c) 2002-2005 OGC, All Rights Reserved. For conditions, see OGC Software Notice http://www.opengeospatial.org/about/?page=ipr
		This schema encodes the Coordinate Operation (CC_) package of the extended UML Model for OGC Abstract Specification Topic 2: Spatial Referencing by Coordinates. That UML model is adapted from ISO 19111 - Spatial referencing by coordinates, as described in Annex C of Topic 2. 
		Caution: The CRS package in GML 3.1 and GML 3.1.1 is preliminary, and is expected to undergo some modifications that are not backward compatible during the development of GML 3.2 (ISO 19136). The GML 3.2 package will implement the model described in the revised version of ISO 19111. </documentation>
	</annotation>
	<!-- ======================================================
       includes and imports
	====================================================== -->
	<include schemaLocation="referenceSystems.xsd"/>
	<include schemaLocation="dataQuality.xsd"/>
	<!-- ======================================================
       elements and types
	====================================================== -->
	<element name="_CoordinateOperation" type="gml:AbstractCoordinateOperationType" abstract="true" substitutionGroup="gml:Definition"/>
	<!-- =================================================== -->
	<complexType name="AbstractCoordinateOperationBaseType" abstract="true">
		<annotation>
			<documentation>Basic encoding for coordinate operation objects, simplifying and restricting the DefinitionType as needed. </documentation>
		</annotation>
		<complexContent>
			<restriction base="gml:DefinitionType">
				<sequence>
					<element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/>
					<element ref="gml:coordinateOperationName"/>
				</sequence>
				<attribute ref="gml:id" use="required"/>
			</restriction>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="coordinateOperationName" type="gml:CodeType" substitutionGroup="gml:name">
		<annotation>
			<documentation>The name by which this coordinate operation is identified. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<complexType name="AbstractCoordinateOperationType" abstract="true">
		<annotation>
			<documentation>A mathematical operation on coordinates that transforms or converts coordinates to another coordinate reference system. Many but not all coordinate operations (from CRS A to CRS B) also uniquely define the inverse operation (from CRS B to CRS A). In some cases, the operation method algorithm for the inverse operation is the same as for the forward algorithm, but the signs of some operation parameter values must be reversed. In other cases, different algorithms are required for the forward and inverse operations, but the same operation parameter values are used. If (some) entirely different parameter values are needed, a different coordinate operation shall be defined.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCoordinateOperationBaseType">
				<sequence>
					<element ref="gml:coordinateOperationID" minOccurs="0" maxOccurs="unbounded">
						<annotation>
							<documentation>Set of alternative identifications of this coordinate operation. The first coordinateOperationID, if any, is normally the primary identification code, and any others are aliases. </documentation>
						</annotation>
					</element>
					<element ref="gml:remarks" minOccurs="0">
						<annotation>
							<documentation>Comments on or information about this coordinate operation, including source information. </documentation>
						</annotation>
					</element>
					<element ref="gml:operationVersion" minOccurs="0"/>
					<element ref="gml:validArea" minOccurs="0"/>
					<element ref="gml:scope" minOccurs="0"/>
					<element ref="gml:_positionalAccuracy" minOccurs="0" maxOccurs="unbounded">
						<annotation>
							<documentation>Unordered set of estimates of the impact of this coordinate operation on point position accuracy. Gives position error estimates for target coordinates of this coordinate operation, assuming no errors in source coordinates. </documentation>
						</annotation>
					</element>
					<element ref="gml:sourceCRS" minOccurs="0"/>
					<element ref="gml:targetCRS" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="coordinateOperationID" type="gml:IdentifierType">
		<annotation>
			<documentation>An identification of a coordinate operation. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="operationVersion" type="string">
		<annotation>
			<documentation>Version of the coordinate transformation (i.e., instantiation due to the stochastic nature of the parameters). Mandatory when describing a transformation, and should not be supplied for a conversion. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="sourceCRS" type="gml:CRSRefType">
		<annotation>
			<documentation>Association to the source CRS (coordinate reference system) of this coordinate operation. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="targetCRS" type="gml:CRSRefType">
		<annotation>
			<documentation>Association to the target CRS (coordinate reference system) of this coordinate operation. For constraints on multiplicity of "sourceCRS" and "targetCRS", see UML model of Coordinate Operation package in OGC Abstract Specification topic 2. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="coordinateOperationRef" type="gml:CoordinateOperationRefType"/>
	<!-- =================================================== -->
	<complexType name="CoordinateOperationRefType">
		<annotation>
			<documentation>Association to a coordinate operation, either referencing or containing the definition of that coordinate operation. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:_CoordinateOperation"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="ConcatenatedOperation" type="gml:ConcatenatedOperationType" substitutionGroup="gml:_CoordinateOperation"/>
	<!-- =================================================== -->
	<complexType name="ConcatenatedOperationType">
		<annotation>
			<documentation>An ordered sequence of two or more single coordinate operations. The sequence of operations is constrained by the requirement that the source coordinate reference system of step (n+1) must be the same as the target coordinate reference system of step (n). The source coordinate reference system of the first step and the target coordinate reference system of the last step are the source and target coordinate reference system associated with the concatenated operation. Instead of a forward operation, an inverse operation may be used for one or more of the operation steps mentioned above, if the inverse operation is uniquely defined by the forward operation.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCoordinateOperationType">
				<sequence>
					<element ref="gml:usesSingleOperation" minOccurs="2" maxOccurs="unbounded">
						<annotation>
							<documentation>Ordered sequence of associations to the two or more single operations used by this concatenated operation. </documentation>
						</annotation>
					</element>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="usesSingleOperation" type="gml:SingleOperationRefType">
		<annotation>
			<documentation>Association to a single operation. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="concatenatedOperationRef" type="gml:ConcatenatedOperationRefType"/>
	<!-- =================================================== -->
	<complexType name="ConcatenatedOperationRefType">
		<annotation>
			<documentation>Association to a concatenated operation, either referencing or containing the definition of that concatenated operation. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:ConcatenatedOperation"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="_SingleOperation" type="gml:AbstractCoordinateOperationType" abstract="true" substitutionGroup="gml:_CoordinateOperation">
		<annotation>
			<documentation>A single (not concatenated) coordinate operation. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="singleOperationRef" type="gml:SingleOperationRefType"/>
	<!-- =================================================== -->
	<complexType name="SingleOperationRefType">
		<annotation>
			<documentation>Association to a single operation, either referencing or containing the definition of that single operation. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:_SingleOperation"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="PassThroughOperation" type="gml:PassThroughOperationType" substitutionGroup="gml:_SingleOperation"/>
	<!-- =================================================== -->
	<complexType name="PassThroughOperationType">
		<annotation>
			<documentation>A pass-through operation specifies that a subset of a coordinate tuple is subject to a specific coordinate operation. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCoordinateOperationType">
				<sequence>
					<element ref="gml:modifiedCoordinate" maxOccurs="unbounded">
						<annotation>
							<documentation>Ordered sequence of positive integers defining the positions in a coordinate tuple of the coordinates affected by this pass-through operation. </documentation>
						</annotation>
					</element>
					<element ref="gml:usesOperation"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="modifiedCoordinate" type="positiveInteger">
		<annotation>
			<documentation>A positive integer defining a position in a coordinate tuple. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="usesOperation" type="gml:OperationRefType">
		<annotation>
			<documentation>Association to the operation applied to the specified ordinates. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="passThroughOperationRef" type="gml:PassThroughOperationRefType"/>
	<!-- =================================================== -->
	<complexType name="PassThroughOperationRefType">
		<annotation>
			<documentation>Association to a pass through operation, either referencing or containing the definition of that pass through operation. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:PassThroughOperation"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="_Operation" type="gml:AbstractCoordinateOperationType" abstract="true" substitutionGroup="gml:_SingleOperation">
		<annotation>
			<documentation>A parameterized mathematical operation on coordinates that transforms or converts coordinates to another coordinate reference system. This coordinate operation uses an operation method, usually with associated parameter values. However, operation methods and parameter values are directly associated with concrete subtypes, not with this abstract type.

This abstract complexType shall not be directly used, extended, or restricted in a compliant Application Schema. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="operationRef" type="gml:OperationRefType"/>
	<!-- =================================================== -->
	<complexType name="OperationRefType">
		<annotation>
			<documentation>Association to an abstract operation, either referencing or containing the definition of that operation. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:_Operation"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<!-- =================================================== -->
	<element name="_GeneralConversion" type="gml:AbstractGeneralConversionType" abstract="true" substitutionGroup="gml:_Operation"/>
	<!-- =================================================== -->
	<complexType name="AbstractGeneralConversionType" abstract="true">
		<annotation>
			<documentation>An abstract operation on coordinates that does not include any change of datum. The best-known example of a coordinate conversion is a map projection. The parameters describing coordinate conversions are defined rather than empirically derived. Note that some conversions have no parameters.

This abstract complexType is expected to be extended for well-known operation methods with many Conversion instances, in Application Schemas that define operation-method-specialized element names and contents. This conversion uses an operation method, usually with associated parameter values. However, operation methods and parameter values are directly associated with concrete subtypes, not with this abstract type. All concrete types derived from this type shall extend this type to include a "usesMethod" element that references the "OperationMethod" element. Similarly, all concrete types derived from this type shall extend this type to include zero or more elements each named "uses...Value" that each use the type of an element substitutable for the "_generalParameterValue" element. </documentation>
		</annotation>
		<complexContent>
			<restriction base="gml:AbstractCoordinateOperationType">
				<sequence>
					<element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/>
					<element ref="gml:coordinateOperationName"/>
					<element ref="gml:coordinateOperationID" minOccurs="0" maxOccurs="unbounded"/>
					<element ref="gml:remarks" minOccurs="0"/>
					<element ref="gml:validArea" minOccurs="0"/>
					<element ref="gml:scope" minOccurs="0"/>
					<element ref="gml:_positionalAccuracy" minOccurs="0" maxOccurs="unbounded"/>
				</sequence>
				<attribute ref="gml:id" use="required"/>
			</restriction>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="generalConversionRef" type="gml:GeneralConversionRefType"/>
	<!-- =================================================== -->
	<complexType name="GeneralConversionRefType">
		<annotation>
			<documentation>Association to a general conversion, either referencing or containing the definition of that conversion. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:_GeneralConversion"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>