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<?xml version="1.0" encoding="UTF-8"?>
<!--
    OGC LICENSE HEADER

    The official OGC XML schemas can be accessed under http://schemas.opengis.net.
    Please consider the schema copyright notices: http://www.opengeospatial.org/ogc/document
    and the OGC Copyright Notice and Disclaimers: http://www.opengeospatial.org/ogc/legal
    If there are any questions left there is also a copyright FAQ: http://www.opengeospatial.org/ogc/legalfaq
-->
<schema xmlns:gml="http://www.opengis.net/gml" 
        xmlns="http://www.w3.org/2001/XMLSchema" xmlns:sa="http://www.opengis.net/sampling/1.0"
        targetNamespace="http://www.opengis.net/sampling/1.0" elementFormDefault="qualified"
        attributeFormDefault="unqualified" version="1.0.3">
	<annotation>
		<documentation>samplingManifold.xsd

SamplingFeatures are feature types that are used primarily for making observations: 
SamplingFeature,  and collections are described in samplingBase.xsd

SamplingPoint (0-D)
SamplingCurve (1-D)
SamplingSurface (2-D)
SamplingSolid (3-D) are described in this schema document

In many cases the properties of interest vary within the site, so may be represented as a coverage associated with the SamplingFeature. 

Sampling is an OGC Standard.
Copyright (c) 2007,2010 Open Geospatial Consortium.
To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
		</documentation>
	</annotation>
	<!-- ====================================================================== -->
	<!-- bring in other schemas -->
	<import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/3.1.1/base/gml.xsd"/>
	<include schemaLocation="./sampling.xsd"/>
	<!-- ====================================================================== -->
	<!-- ====================================================================== -->
	<!-- 0-D sampling regimes -->
	<!-- ====================================================================== -->
	<complexType name="SamplingPointType">
		<annotation>
			<documentation>A "SamplingPoint" is an identified position (0-D geospatial feature). 
		It may be revisited for various purposes, in particular to retrieve multiple specimens or make repeated or complementary observations. 
		The position property of the SamplingPoint provides the value of the position property of observations an specimens associated with the SamplingPoint. 
		By using the SamplingPoint feature, this position information and any metadata associated with it may be encoded in one place, i.e. normalised, and then re-used _by reference_ on other feature instances associated with it.
		SamplingPoints are often known as Stations</documentation>
		</annotation>
		<complexContent>
			<extension base="sa:SamplingFeatureType">
				<sequence>
					<element name="position" type="gml:PointPropertyType"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- .................. -->
	<element name="SamplingPoint" type="sa:SamplingPointType" substitutionGroup="sa:SamplingFeature"/>
	<!-- .................. -->
	<complexType name="SamplingPointPropertyType">
		<sequence minOccurs="0">
			<element ref="sa:SamplingPoint"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- ====================================================================== -->
	<!-- Extensive sampling regimes -->
	<!-- ====================================================================== -->
	<complexType name="SpatiallyExtensiveSamplingFeatureType">
		<annotation>
			<documentation>SpatiallyExtensiveSamplingFeature is the root class for sampling manifolds that are extensive in 1- 2- or 3-D.</documentation>
		</annotation>
		<complexContent>
			<extension base="sa:SamplingFeatureType"/>
		</complexContent>
	</complexType>
	<!-- .................. -->
	<element name="SpatiallyExtensiveSamplingFeature" abstract="true" type="sa:SpatiallyExtensiveSamplingFeatureType" substitutionGroup="sa:SamplingFeature"/>
	<!-- .................. -->
	<complexType name="SpatiallyExtensiveSamplingFeaturePropertyType">
		<sequence minOccurs="0">
			<element ref="sa:SpatiallyExtensiveSamplingFeature"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- ====================================================================== -->
	<!-- 1-D sites and sampling regimes -->
	<!-- ====================================================================== -->
	<complexType name="SamplingCurveType">
		<annotation>
			<documentation>A "SamplingCurve" is an identified 1-D spatial feature. 
		It may be revisited for various purposes, in particular to retrieve multiple specimens or make repeated or complementary observations.
		Specialized names for SamplingCurve include Sounding, ObservationWell, FlightLine, Transect.</documentation>
		</annotation>
		<complexContent>
			<extension base="sa:SpatiallyExtensiveSamplingFeatureType">
				<sequence>
					<element name="shape" type="gml:CurvePropertyType"/>
					<element name="length" type="gml:MeasureType" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- .................. -->
	<element name="SamplingCurve" type="sa:SamplingCurveType" substitutionGroup="sa:SpatiallyExtensiveSamplingFeature">
		<annotation>
			<documentation>A "SamplingCurve" is an identified 1-D spatial feature. 
		It may be revisited for various purposes, in particular to retrieve multiple specimens or make repeated or complementary observations.
		Specialized names for SamplingCurve include Profile, ObservationWell, FlightLine, Transect.</documentation>
		</annotation>
	</element>
	<!-- .................. -->
	<complexType name="SamplingCurvePropertyType">
		<sequence minOccurs="0">
			<element ref="sa:SamplingCurve"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- ====================================================================== -->
	<!-- 2-D sites and sampling regimes -->
	<!-- ====================================================================== -->
	<complexType name="SamplingSurfaceType">
		<annotation>
			<documentation>A "SamplingSurface" is an identified 2-D spatial feature. 
		It may be used for various purposes, in particular for observations of cross sections through features.
		Specialized names for SamplingSurface include CrossSection, Section, Flitch, Swath, Scene, MapHorizon.</documentation>
		</annotation>
		<complexContent>
			<extension base="sa:SpatiallyExtensiveSamplingFeatureType">
				<sequence>
					<element name="shape" type="gml:SurfacePropertyType"/>
					<element name="area" type="gml:MeasureType" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- .................. -->
	<element name="SamplingSurface" type="sa:SamplingSurfaceType" substitutionGroup="sa:SpatiallyExtensiveSamplingFeature">
		<annotation>
			<documentation>A "SamplingSurface" is an identified 2-D spatial feature. 
		It may be used for various purposes, in particular for observations of cross sections through features.
		Specialized names for SamplingSurface include CrossSection, Section, Flitch, Swath, Scene, MapHorizon.</documentation>
		</annotation>
	</element>
	<!-- .................. -->
	<complexType name="SamplingSurfacePropertyType">
		<sequence minOccurs="0">
			<element ref="sa:SamplingSurface"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- ====================================================================== -->
	<!-- 3-D sites and sampling regimes -->
	<!-- ====================================================================== -->
	<complexType name="SamplingSolidType">
		<annotation>
			<documentation>A "SamplingSolid" is an identified 3-D spatial feature used in sampling.</documentation>
		</annotation>
		<complexContent>
			<extension base="sa:SpatiallyExtensiveSamplingFeatureType">
				<sequence>
					<element name="shape" type="gml:SolidPropertyType"/>
					<element name="volume" type="gml:MeasureType" minOccurs="0"/>
				</sequence>
			</extension>
		</complexContent>
	</complexType>
	<!-- .................. -->
	<element name="SamplingSolid" type="sa:SamplingSolidType" substitutionGroup="sa:SpatiallyExtensiveSamplingFeature">
		<annotation>
			<documentation>A "SamplingSolid" is an identified 3-D spatial feature used in sampling.</documentation>
		</annotation>
	</element>
	<!-- .................. -->
	<complexType name="SamplingSolidPropertyType">
		<sequence minOccurs="0">
			<element ref="sa:SamplingSolid"/>
		</sequence>
		<attributeGroup ref="gml:AssociationAttributeGroup"/>
	</complexType>
	<!-- ====================================================================== -->
	<!-- ====================================================================== -->
</schema>
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