geometryprimitives.xsd

XML Schema Documents for GML Version 3.1.1 GML通用GIS文件格式Schema。

<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSPY v5 rel. 2 U (http://www.xmlspy.com) by Clemens Portele (interactive instruments) -->
<schema targetNamespace="http://www.opengis.net/gml" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:sch="http://www.ascc.net/xml/schematron" xmlns:gml="http://www.opengis.net/gml" xmlns:xlink="http://www.w3.org/1999/xlink" elementFormDefault="qualified"
        version="3.1.1">
	<annotation>
		<appinfo source="urn:opengis:specification:gml:schema-xsd:geometryPrimitives:3.1.1">geometryPrimitives.xsd</appinfo>
		<documentation>Copyright (c) 2001-2005 OGC, All Rights Reserved.
	For conditions, see OGC Software Notice http://www.opengeospatial.org/about/?page=ipr</documentation>
	</annotation>
	<!-- =========================================================== -->
	<include schemaLocation="geometryBasic2d.xsd"/>
	<!-- =========================================================== -->
	<element name="Curve" type="gml:CurveType" substitutionGroup="gml:_Curve"/>
	<!-- =========================================================== -->
	<complexType name="CurveType">
		<annotation>
			<documentation>Curve is a 1-dimensional primitive. Curves are continuous, connected, and have a measurable length in terms of the coordinate system. 
				A curve is composed of one or more curve segments. Each curve segment within a curve may be defined using a different interpolation method. The curve segments are connected to one another, with the end point of each segment except the last being the start point of the next segment in the segment list.
				The orientation of the curve is positive.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCurveType">
				<sequence>
					<element ref="gml:segments">
						<annotation>
							<documentation>This element encapsulates the segments of the curve.</documentation>
						</annotation>
					</element>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- =========================================================== -->
	<element name="baseCurve" type="gml:CurvePropertyType">
		<annotation>
			<appinfo>
				<sch:pattern name="Check either href or content not both">
					<sch:rule context="gml:baseCurve">
						<sch:extends rule="hrefOrContent"/>
					</sch:rule>
				</sch:pattern>
			</appinfo>
			<documentation>This property element either references a curve via the XLink-attributes or contains the curve element. A curve element is any element which is substitutable for "_Curve".</documentation>
		</annotation>
	</element>
	<!-- =========================================================== -->
	<element name="OrientableCurve" type="gml:OrientableCurveType" substitutionGroup="gml:_Curve"/>
	<!-- =========================================================== -->
	<complexType name="OrientableCurveType">
		<annotation>
			<documentation>OrientableCurve consists of a curve and an orientation. If the orientation is "+", then the OrientableCurve is identical to the baseCurve. If the orientation is "-", then the OrientableCurve is related to another _Curve with a parameterization that reverses the sense of the curve traversal.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCurveType">
				<sequence>
					<element ref="gml:baseCurve">
						<annotation>
							<documentation>References or contains the base curve (positive orientation).
NOTE: This definition allows for a nested structure, i.e. an OrientableCurve may use another OrientableCurve as its base curve.</documentation>
						</annotation>
					</element>
				</sequence>
				<attribute name="orientation" type="gml:SignType" default="+">
					<annotation>
						<documentation>If the orientation is "+", then the OrientableCurve is identical to the baseCurve. If the orientation is "-", then the OrientableCurve is related to another _Curve with a parameterization that reverses the sense of the curve traversal. "+" is the default value.</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<!-- =========================================================== -->
	<!-- curve segments (1-dimensional) -->
	<!-- =========================================================== -->
	<!-- =========================================================== -->
	<element name="_CurveSegment" type="gml:AbstractCurveSegmentType" abstract="true">
		<annotation>
			<documentation>The "_CurveSegment" element is the abstract head of the substituition group for all curve segment elements, i.e. continuous segments of the same interpolation mechanism.</documentation>
		</annotation>
	</element>
	<!-- =========================================================== -->
	<complexType name="AbstractCurveSegmentType" abstract="true">
		<annotation>
			<documentation>Curve segment defines a homogeneous segment of a curve.</documentation>
		</annotation>
		<sequence/>
		<attribute name="numDerivativesAtStart" type="integer" use="optional" default="0">
			<annotation>
				<documentation>The attribute "numDerivativesAtStart" specifies the type of continuity between this curve segment and its predecessor. If this is the first curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.</documentation>
			</annotation>
		</attribute>
		<attribute name="numDerivativesAtEnd" type="integer" use="optional" default="0">
			<annotation>
				<documentation>The attribute "numDerivativesAtEnd" specifies the type of continuity between this curve segment and its successor. If this is the last curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.</documentation>
			</annotation>
		</attribute>
		<attribute name="numDerivativeInterior" type="integer" use="optional" default="0">
			<annotation>
				<documentation>The attribute "numDerivativesInterior" specifies the type of continuity that is guaranteed interior to the curve. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity.
NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.</documentation>
			</annotation>
		</attribute>
	</complexType>
	<!-- =========================================================== -->
	<element name="segments" type="gml:CurveSegmentArrayPropertyType">
		<annotation>
			<documentation>This property element contains a list of curve segments. The order of the elements is significant and shall be preserved when processing the array.</documentation>
		</annotation>
	</element>
	<!-- =========================================================== -->
	<complexType name="CurveSegmentArrayPropertyType">
		<annotation>
			<documentation>A container for an array of curve segments.</documentation>
		</annotation>
		<sequence>
			<element ref="gml:_CurveSegment" minOccurs="0" maxOccurs="unbounded"/>
		</sequence>
	</complexType>
	<!-- =========== global element in "_CurveSegment" substitution group ================ -->
	<element name="LineStringSegment" type="gml:LineStringSegmentType" substitutionGroup="gml:_CurveSegment"/>
	<!-- =========================================================== -->
	<complexType name="LineStringSegmentType">
		<annotation>
			<documentation>A LineStringSegment is a curve segment that is defined by two or more coordinate tuples, with linear interpolation between them.
				Note: LineStringSegment implements GM_LineString of ISO 19107.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCurveSegmentType">
				<sequence>
					<choice>
						<annotation>
							<documentation>GML supports two different ways to specify the control points of a curve segment.
1. A sequence of "pos" (DirectPositionType) or "pointProperty" (PointPropertyType) elements. "pos" elements are control points that are only part of this curve segment, "pointProperty" elements contain a point that may be referenced from other geometry elements or reference another point defined outside of this curve segment (reuse of existing points).
2. The "posList" element allows for a compact way to specifiy the coordinates of the control points, if all control points are in the same coordinate reference systems and belong to this curve segment only. The number of direct positions in the list must be at least two.</documentation>
						</annotation>
						<choice minOccurs="2" maxOccurs="unbounded">
							<element ref="gml:pos"/>
							<element ref="gml:pointProperty"/>
							<element ref="gml:pointRep">
								<annotation>
									<documentation>Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility with GML 3.0.0.</documentation>
								</annotation>
							</element>
						</choice>
						<element ref="gml:posList"/>
						<element ref="gml:coordinates">
							<annotation>
								<documentation>Deprecated with GML version 3.1.0. Use "posList" instead.</documentation>
							</annotation>
						</element>
					</choice>
				</sequence>
				<attribute name="interpolation" type="gml:CurveInterpolationType" fixed="linear">
					<annotation>
						<documentation>The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism
uses the control points and control parameters to determine the position of this curve segment. For a LineStringSegment the interpolation is fixed as "linear".</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<!-- =========== global element in "_CurveSegment" substitution group ================ -->
	<element name="ArcString" type="gml:ArcStringType" substitutionGroup="gml:_CurveSegment"/>
	<!-- =========================================================== -->
	<complexType name="ArcStringType">
		<annotation>
			<documentation>An ArcString is a curve segment that uses three-point circular arc interpolation.</documentation>
		</annotation>
		<complexContent>
			<extension base="gml:AbstractCurveSegmentType">
				<sequence>
					<choice>
						<annotation>
							<documentation>GML supports two different ways to specify the control points of a curve segment.
1. A sequence of "pos" (DirectPositionType) or "pointProperty" (PointPropertyType) elements. "pos" elements are control points that are only part of this curve segment, "pointProperty" elements contain a point that may be referenced from other geometry elements or reference another point defined outside of this curve segment (reuse of existing points).
2. The "posList" element allows for a compact way to specifiy the coordinates of the control points, if all control points are in the same coordinate reference systems and belong to this curve segment only. The number of direct positions in the list must be at least three.</documentation>
						</annotation>
						<choice minOccurs="3" maxOccurs="unbounded">
							<element ref="gml:pos"/>
							<element ref="gml:pointProperty"/>
							<element ref="gml:pointRep">
								<annotation>
									<documentation>Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility with GML 3.0.0.</documentation>
								</annotation>
							</element>
						</choice>
						<element ref="gml:posList"/>
						<element ref="gml:coordinates">
							<annotation>
								<documentation>Deprecated with GML version 3.1.0. Use "posList" instead.</documentation>
							</annotation>
						</element>
					</choice>
				</sequence>
				<attribute name="interpolation" type="gml:CurveInterpolationType" fixed="circularArc3Points">
					<annotation>
						<documentation>The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism
uses the control points and control parameters to determine the position of this curve segment. For an ArcString the interpolation is fixed as "circularArc3Points".</documentation>
					</annotation>
				</attribute>
				<attribute name="numArc" type="integer" use="optional">
					<annotation>
						<documentation>The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be 2 * numArc + 1.</documentation>
					</annotation>
				</attribute>
			</extension>
		</complexContent>
	</complexType>
	<!-- =========== global element in "_CurveSegment" substitution group ================ -->
	<element name="Arc" type="gml:ArcType" substitutionGroup="gml:ArcString"/>
	<!-- =========================================================== -->
	<complexType name="ArcType">
		<annotation>
			<documentation>An Arc is an arc string with only one arc unit, i.e. three control points.</documentation>
		</annotation>
		<complexContent>
			<restriction base="gml:ArcStringType">
				<sequence>
					<choice>