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<?xml version="1.0" encoding="UTF-8"?>
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<schema targetNamespace="http://www.opengis.net/gml" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="3.1.1">
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	<annotation>
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		<appinfo source="urn:opengis:specification:gml:schema-xsd:observation:3.1.1">observation.xsd</appinfo>
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		<documentation>Observation schema for GML 3.1
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    Copyright (c) 2002-2005 OGC, All Rights Reserved.
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	For conditions, see OGC Software Notice http://www.opengeospatial.org/about/?page=ipr</documentation>
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	</annotation>
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	<!-- =================================================================== -->
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	<!-- ===       includes and imports ============================================ -->
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	<include schemaLocation="feature.xsd"/>
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	<include schemaLocation="direction.xsd"/>
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	<include schemaLocation="valueObjects.xsd"/>
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	<!-- =================================================================== -->
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	<!-- =================== properties =================================== -->
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	<element name="using" type="gml:FeaturePropertyType">
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		<annotation>
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			<documentation>This element contains or points to a description of a sensor, instrument or procedure used for the observation</documentation>
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		</annotation>
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	</element>
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	<!-- =================================================================== -->
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	<element name="target" type="gml:TargetPropertyType">
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		<annotation>
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			<documentation>This element contains or points to the specimen, region or station which is the object of the observation</documentation>
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		</annotation>
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	</element>
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	<!-- =================================================================== -->
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	<element name="subject" type="gml:TargetPropertyType" substitutionGroup="gml:target">
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		<annotation>
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			<documentation>Synonym for target - common word used for photographs</documentation>
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		</annotation>
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	</element>
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	<!-- =================================================================== -->
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	<complexType name="TargetPropertyType">
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		<annotation>
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			<documentation>Container for an object representing the target or subject of an observation.</documentation>
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		</annotation>
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		<sequence minOccurs="0">
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			<choice>
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				<element ref="gml:_Feature"/>
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				<element ref="gml:_Geometry"/>
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			</choice>
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		</sequence>
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		<attributeGroup ref="gml:AssociationAttributeGroup"/>
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	</complexType>
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	<!-- =================================================================== -->
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	<element name="resultOf" type="gml:AssociationType">
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		<annotation>
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			<documentation>The result of the observation: an image, external object, etc</documentation>
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		</annotation>
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	</element>
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	<!-- =================================================================== -->
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	<!-- ===================== Features =========================== -->
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	<element name="Observation" type="gml:ObservationType" substitutionGroup="gml:_Feature"/>
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	<!-- =========================================================== -->
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	<complexType name="ObservationType">
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		<complexContent>
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			<extension base="gml:AbstractFeatureType">
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				<sequence>
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					<element ref="gml:validTime"/>
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					<element ref="gml:using" minOccurs="0"/>
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					<element ref="gml:target" minOccurs="0"/>
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					<element ref="gml:resultOf"/>
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				</sequence>
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			</extension>
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		</complexContent>
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	</complexType>
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	<!-- =========================================================== -->
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	<element name="DirectedObservation" type="gml:DirectedObservationType" substitutionGroup="gml:Observation"/>
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	<!-- =========================================================== -->
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	<complexType name="DirectedObservationType">
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		<complexContent>
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			<extension base="gml:ObservationType">
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				<sequence>
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					<element ref="gml:direction"/>
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				</sequence>
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			</extension>
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		</complexContent>
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	</complexType>
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	<!-- =========================================================== -->
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	<element name="DirectedObservationAtDistance" type="gml:DirectedObservationAtDistanceType" substitutionGroup="gml:DirectedObservation"/>
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	<!-- =========================================================== -->
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	<complexType name="DirectedObservationAtDistanceType">
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		<complexContent>
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			<extension base="gml:DirectedObservationType">
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				<sequence>
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					<element name="distance" type="gml:MeasureType"/>
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				</sequence>
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			</extension>
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		</complexContent>
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	</complexType>
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	<!-- =========================================================== -->
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</schema>