<?xml version="1.0" encoding="UTF-8"?><!-- edited with XMLSPY v2004 rel. 2 U (http://www.xmlspy.com) by David Burggraf (Galdos Systems Inc) --><schema targetNamespace="http://www.opengis.net/gml" elementFormDefault="qualified" version="3.1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gml="http://www.opengis.net/gml" xmlns:sch="http://www.ascc.net/xml/schematron"        xmlns="http://www.w3.org/2001/XMLSchema">	<annotation>		<appinfo source="urn:opengis:specification:gml:schema-xsd:geometryBasic0d1d:v3.1.1">geometryBasic0d1d.xsd</appinfo>		<appinfo source="urn:opengis:specification:gml:schema-xsd:geometryBasic0d1d:v3.1.1">			<sch:title>Schematron validation</sch:title>			<sch:pattern name="Check SRS tags">				<sch:rule abstract="true" id="CRSLabels">					<sch:report test="not(@srsDimension) or @srsName">The presence of a dimension attribute implies the presence of the srsName attribute.</sch:report>					<sch:report test="not(@axisLabels) or @srsName">The presence of an axisLabels attribute implies the presence of the srsName attribute.</sch:report>					<sch:report test="not(@uomLabels) or @srsName">The presence of an uomLabels attribute implies the presence of the srsName attribute.</sch:report>					<sch:report test="(not(@uomLabels) and not(@axisLabels)) or (@uomLabels and @axisLabels)">The presence of an uomLabels attribute implies the presence of the axisLabels attribute and vice versa.</sch:report>				</sch:rule>			</sch:pattern>			<sch:pattern name="Check Dimension">				<sch:rule abstract="true" id="Count">					<sch:report test="not(@count) or @srsDimension">The presence of a count attribute implies the presence of the dimension attribute.</sch:report>				</sch:rule>			</sch:pattern>		</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="measures.xsd">		<annotation>			<documentation>This includes not only measures.xsd, but also units.xsd, gmlBase.xsd and basicTypes.xsd.</documentation>		</annotation>	</include>	<!-- ============================================================== -->	<!-- ===========  abstract supertype for geometry objects =================== -->	<!-- ============================================================== -->	<element name="_Geometry" type="gml:AbstractGeometryType" abstract="true" substitutionGroup="gml:_GML">		<annotation>			<documentation>The "_Geometry" element is the abstract head of the substituition group for all geometry elements of GML 3. This 			includes pre-defined and user-defined geometry elements. Any geometry element must be a direct or indirect extension/restriction 			of AbstractGeometryType and must be directly or indirectly in the substitution group of "_Geometry".</documentation>			<appinfo>				<sch:pattern name="Check SRS tags">					<sch:rule context="gml:_Geometry">						<sch:extends rule="CRSLabels"/>					</sch:rule>				</sch:pattern>			</appinfo>		</annotation>	</element>	<!-- ============================================================== -->	<complexType name="GeometryPropertyType">		<annotation>			<documentation>A geometric property can either be any geometry element encapsulated in an element of this type or an XLink reference 			to a remote geometry element (where remote includes geometry elements located elsewhere in the same document). Note that either 			the reference or the contained element must be given, but not both or none.</documentation>		</annotation>		<sequence minOccurs="0">			<element ref="gml:_Geometry"/>		</sequence>		<attributeGroup ref="gml:AssociationAttributeGroup">			<annotation>				<documentation>This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference 				remote resources (including those elsewhere in the same document). A simple link element can be constructed by 				including a specific set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation 				of the World Wide Web Consortium. XLink allows elements to be inserted into XML documents so as to create 				sophisticated links between resources; such links can be used to reference remote properties. A simple link element 				can be used to implement pointer functionality, and this functionality has been built into various GML 3 elements by 				including the gml:AssociationAttributeGroup.</documentation>			</annotation>		</attributeGroup>	</complexType>	<!-- ============================================================== -->	<complexType name="GeometryArrayPropertyType">		<annotation>			<documentation>A container for an array of geometry elements. The elements are always contained in the array property, 			referencing geometry elements or arrays of geometry elements is not supported.</documentation>		</annotation>		<sequence>			<element ref="gml:_Geometry" minOccurs="0" maxOccurs="unbounded"/>		</sequence>	</complexType>	<!-- ============================================================== -->	<complexType name="AbstractGeometryType" abstract="true">		<annotation>			<documentation>All geometry elements are derived directly or indirectly from this abstract supertype. A geometry element may 			have an identifying attribute ("gml:id"), a name (attribute "name") and a description (attribute "description"). It may be associated 			with a spatial reference system (attribute "srsName"). The following rules shall be adhered: - Every geometry type shall derive 			from this abstract type. - Every geometry element (i.e. an element of a geometry type) shall be directly or indirectly in the 			substitution group of _Geometry.</documentation>		</annotation>		<complexContent>			<extension base="gml:AbstractGMLType">				<attribute name="gid" type="string" use="optional">					<annotation>						<documentation>This attribute is included for backward compatibility with GML 2 and is deprecated with GML 3. 						This identifer is superceded by "gml:id" inherited from AbstractGMLType. The attribute "gid" should not be used 						anymore and may be deleted in future versions of GML without further notice.</documentation>					</annotation>				</attribute>				<attributeGroup ref="gml:SRSReferenceGroup"/>			</extension>		</complexContent>	</complexType>	<!-- ============================================================== -->	<attributeGroup name="SRSReferenceGroup">		<annotation>			<documentation>Optional reference to the CRS used by this geometry, with optional additional information to simplify use when 			a more complete definition of the CRS is not needed.</documentation>		</annotation>		<attribute name="srsName" type="anyURI" use="optional">			<annotation>				<documentation>In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType 				(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the 				location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this 				geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified 				at the direct position level only in rare cases.</documentation>			</annotation>		</attribute>		<attribute name="srsDimension" type="positiveInteger" use="optional">			<annotation>				<documentation>The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is 				specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted.</documentation>			</annotation>		</attribute>		<attributeGroup ref="gml:SRSInformationGroup"/>	</attributeGroup>	<!-- =================================================== -->	<attributeGroup name="SRSInformationGroup">		<annotation>			<documentation>Optional additional and redundant information for a CRS to simplify use when a more complete definition of the 			CRS is not needed. This information shall be the same as included in the more complete definition of the CRS, referenced by the 			srsName attribute. When the srsName attribute is included, either both or neither of the axisLabels and uomLabels attributes 			shall be included. When the srsName attribute is omitted, both of these attributes shall be omitted.</documentation>		</annotation>		<attribute name="axisLabels" type="gml:NCNameList" use="optional">			<annotation>				<documentation>Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis 				labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional. 				When the srsName attribute is omitted, this attribute shall also be omitted.</documentation>			</annotation>		</attribute>		<attribute name="uomLabels" type="gml:NCNameList" use="optional">			<annotation>				<documentation>Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the 				gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the 				axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute 				shall also be omitted.</documentation>			</annotation>		</attribute>	</attributeGroup>	<!-- ============================================================== -->	<element name="_GeometricPrimitive" type="gml:AbstractGeometricPrimitiveType" abstract="true" substitutionGroup="gml:_Geometry">		<annotation>			<documentation>The "_GeometricPrimitive" element is the abstract head of the substituition group for all (pre- and user-defined) 			geometric primitives.</documentation>		</annotation>	</element>	<!-- ============================================================== -->	<complexType name="AbstractGeometricPrimitiveType" abstract="true">		<annotation>			<documentation>This is the abstract root type of the geometric primitives. A geometric primitive is a geometric object that is not 			decomposed further into other primitives in the system. All primitives are oriented in the direction implied by the sequence of their 			coordinate tuples.</documentation>		</annotation>		<complexContent>			<extension base="gml:AbstractGeometryType"/>		</complexContent>	</complexType>	<!-- ============================================================== -->	<complexType name="GeometricPrimitivePropertyType">		<annotation>			<documentation>A property that has a geometric primitive as its value domain can either be an appropriate geometry element 			encapsulated in an element of this type or an XLink reference to a remote geometry element (where remote includes geometry 			elements located elsewhere in the same document). Either the reference or the contained element must be given, but neither 			both nor none.</documentation>		</annotation>		<sequence minOccurs="0">			<element ref="gml:_GeometricPrimitive"/>		</sequence>		<attributeGroup ref="gml:AssociationAttributeGroup">			<annotation>				<documentation>This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference remote 				resources (including those elsewhere in the same document). A simple link element can be constructed by including a 				specific set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation of the World Wide 				Web Consortium. XLink allows elements to be inserted into XML documents so as to create sophisticated links between 				resources; such links can be used to reference remote properties. A simple link element can be used to implement pointer 				functionality, and this functionality has been built into various GML 3 elements by including the gml:AssociationAttributeGroup.</documentation>			</annotation>		</attributeGroup>	</complexType>	<!-- =========================================================== -->	<!-- primitive geometry objects (0-dimensional) -->	<!-- ============================================================== -->	<element name="Point" type="gml:PointType" substitutionGroup="gml:_GeometricPrimitive"/>	<!-- ============================================================== -->	<complexType name="PointType">		<annotation>			<documentation>A Point is defined by a single coordinate tuple.</documentation>		</annotation>		<complexContent>			<extension base="gml:AbstractGeometricPrimitiveType">