coordinatesystems.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:coordinateSystems:3.1.1"/>
		<documentation>How to encode coordinate system definitions. Builds on referenceSystems.xsd to encode the data needed to define coordinate systems, including the specific subtypes of coordinate systems. 
		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 System (CS_) 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"/>
	<!-- ======================================================
       elements and types
	====================================================== -->
	<element name="CoordinateSystemAxis" type="gml:CoordinateSystemAxisType" substitutionGroup="gml:Definition"/>
	<!-- =================================================== -->
	<complexType name="CoordinateSystemAxisBaseType" abstract="true">
		<annotation>
			<documentation>Basic encoding for coordinate system axis 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:name">
						<annotation>
							<documentation>The name by which this coordinate system axis is identified. </documentation>
						</annotation>
					</element>
				</sequence>
				<attribute ref="gml:id" use="required"/>
			</restriction>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<complexType name="CoordinateSystemAxisType">
		<annotation>
			<documentation>Definition of a coordinate system axis. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:CoordinateSystemAxisBaseType">
				<sequence>
					<element ref="gml:axisID" minOccurs="0" maxOccurs="unbounded">
						<annotation>
							<documentation>Set of alternative identifications of this coordinate system axis. The first axisID, 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 system axis, including data source information. </documentation>
						</annotation>
					</element>
					<element ref="gml:axisAbbrev"/>
					<element ref="gml:axisDirection"/>
				</sequence>
				<attribute ref="gml:uom" use="required"/>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="axisID" type="gml:IdentifierType">
		<annotation>
			<documentation>An identification of a coordinate system axis. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="axisAbbrev" type="gml:CodeType">
		<annotation>
			<documentation>The abbreviation used for this coordinate system axis. This abbreviation can be used to identify the ordinates in a coordinate tuple. Examples are X and Y. The codeSpace attribute can reference a source of more information on a set of standardized abbreviations, or on this abbreviation. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="axisDirection" type="gml:CodeType">
		<annotation>
			<documentation>Direction of this coordinate system axis (or in the case of Cartesian projected coordinates, the direction of this coordinate system axis at the origin). Examples: north or south, east or west, up or down. Within any set of coordinate system axes, only one of each pair of terms can be used. For earth-fixed CRSs, this direction is often approximate and intended to provide a human interpretable meaning to the axis. When a geodetic datum is used, the precise directions of the axes may therefore vary slightly from this approximate direction. Note that an EngineeringCRS can include specific descriptions of the directions of its coordinate system axes. For example, the path of a linear CRS axis can be referenced in another document, such as referencing a GML feature that references or includes a curve geometry. The codeSpace attribute can reference a source of more information on a set of standardized directions, or on this direction. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<attribute name="uom" type="anyURI">
		<annotation>
			<documentation>Identifier of the unit of measure used for this coordinate system axis. The value of this coordinate in a coordinate tuple shall be recorded using this unit of measure, whenever those coordinates use a coordinate reference system that uses a coordinate system that uses this axis.</documentation>
		</annotation>
	</attribute>
	<!-- =================================================== -->
	<element name="coordinateSystemAxisRef" type="gml:CoordinateSystemAxisRefType"/>
	<!-- =================================================== -->
	<complexType name="CoordinateSystemAxisRefType">
		<annotation>
			<documentation>Association to a coordinate system axis, either referencing or containing the definition of that axis. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:CoordinateSystemAxis"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<!-- =================================================== -->
	<element name="_CoordinateSystem" type="gml:AbstractCoordinateSystemType" abstract="true" substitutionGroup="gml:Definition"/>
	<!-- =================================================== -->
	<complexType name="AbstractCoordinateSystemBaseType" abstract="true">
		<annotation>
			<documentation>Basic encoding for coordinate system 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:csName"/>
				</sequence>
				<attribute ref="gml:id" use="required"/>
			</restriction>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="csName" type="gml:CodeType" substitutionGroup="gml:name">
		<annotation>
			<documentation>The name by which this coordinate system is identified. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<complexType name="AbstractCoordinateSystemType" abstract="true">
		<annotation>
			<documentation>A coordinate system (CS) is the set of coordinate system axes that spans a given coordinate space. A CS is derived from a set of (mathematical) rules for specifying how coordinates in a given space are to be assigned to points. The coordinate values in a coordinate tuple shall be recorded in the order in which the coordinate system axes associations are recorded, whenever those coordinates use a coordinate reference system that uses this coordinate system. This abstract complexType shall not be used, extended, or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified in this document. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCoordinateSystemBaseType">
				<sequence>
					<element ref="gml:csID" minOccurs="0" maxOccurs="unbounded">
						<annotation>
							<documentation>Set of alternative identifications of this coordinate system. The first csID, 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 system, including data source information. </documentation>
						</annotation>
					</element>
					<element ref="gml:usesAxis" maxOccurs="unbounded">
						<annotation>
							<documentation>Ordered sequence of associations to the coordinate system axes included in this coordinate system. </documentation>
						</annotation>
					</element>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="csID" type="gml:IdentifierType">
		<annotation>
			<documentation>An identification of a coordinate system. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="usesAxis" type="gml:CoordinateSystemAxisRefType">
		<annotation>
			<documentation>Association to a coordinate system axis. </documentation>
		</annotation>
	</element>
	<!-- =================================================== -->
	<element name="coordinateSystemRef" type="gml:CoordinateSystemRefType"/>
	<!-- =================================================== -->
	<complexType name="CoordinateSystemRefType">
		<annotation>
			<documentation>Association to a coordinate system, either referencing or containing the definition of that coordinate system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:_CoordinateSystem"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="EllipsoidalCS" type="gml:EllipsoidalCSType" substitutionGroup="gml:_CoordinateSystem"/>
	<!-- =================================================== -->
	<complexType name="EllipsoidalCSType">
		<annotation>
			<documentation>A two- or three-dimensional coordinate system in which position is specified by geodetic latitude, geodetic longitude, and (in the three-dimensional case) ellipsoidal height. An EllipsoidalCS shall have two or three usesAxis associations. </documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCoordinateSystemType"/>
		</complexContent>
	</complexType>
	<!-- =================================================== -->
	<element name="ellipsoidalCSRef" type="gml:EllipsoidalCSRefType"/>
	<!-- =================================================== -->
	<complexType name="EllipsoidalCSRefType">
		<annotation>
			<documentation>Association to an ellipsoidal coordinate system, either referencing or containing the definition of that coordinate system. </documentation>
		</annotation>
		<sequence minOccurs="0">
			<element ref="gml:EllipsoidalCS"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- =================================================== -->
	<element name="CartesianCS" type="gml:CartesianCSType" substitutionGroup="gml:_CoordinateSystem"/>
	<!-- =================================================== -->
	<complexType name="CartesianCSType">
		<annotation>
			<documentation>A 1-, 2-, or 3-dimensional coordinate system. Gives the position of points relative to orthogonal straight axes in the 2- and 3-dimensional cases. In the 1-dimensional case, it contains a single straight coordinate axis. In the multi-dimensional case, all axes shall have the same length unit of measure. A CartesianCS shall have one, two, or three usesAxis associations. </documentation>
		</annotation>
		<complexContent>