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<?xml version="1.0" encoding="UTF-8"?>
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<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">
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	<annotation>
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		<appinfo source="urn:opengis:specification:gml:schema-xsd:dynamicFeature:3.1.1"/>
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		<documentation xml:lang="en">Basic support for tracking moving objects and objects with changing state.
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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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	<include schemaLocation="feature.xsd"/>
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	<include schemaLocation="direction.xsd"/>
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	<!-- ================================================================== -->
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	<element name="dataSource" type="gml:StringOrRefType"/>
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	<element name="status" type="gml:StringOrRefType"/>
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	<!-- ================================================================== -->
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	<element name="_TimeSlice" type="gml:AbstractTimeSliceType" abstract="true" substitutionGroup="gml:_GML"/>
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	<!-- ===================================== -->
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	<complexType name="AbstractTimeSliceType" abstract="true">
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		<annotation>
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			<documentation xml:lang="en">A timeslice encapsulates the time-varying properties of a dynamic feature--it
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        must be extended to represent a timestamped projection of a feature. The dataSource
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        property describes how the temporal data was acquired.</documentation>
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		</annotation>
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		<complexContent>
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			<extension base="gml:AbstractGMLType">
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				<sequence>
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					<element ref="gml:validTime"/>
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					<element ref="gml:dataSource" minOccurs="0"/>
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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="MovingObjectStatus" type="gml:MovingObjectStatusType" substitutionGroup="gml:_TimeSlice"/>
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	<!-- ===================================== -->
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	<complexType name="MovingObjectStatusType">
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		<annotation>
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			<documentation xml:lang="en">This type encapsulates various dynamic properties of moving objects
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             (points, lines, regions). It is useful for dealing with features whose
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             geometry or topology changes over time.</documentation>
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		</annotation>
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		<complexContent>
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			<extension base="gml:AbstractTimeSliceType">
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				<sequence>
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					<element ref="gml:location"/>
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					<element name="speed" type="gml:MeasureType" minOccurs="0"/>
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					<element name="bearing" type="gml:DirectionPropertyType" minOccurs="0"/>
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					<element name="acceleration" type="gml:MeasureType" minOccurs="0"/>
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					<element name="elevation" type="gml:MeasureType" minOccurs="0"/>
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					<element ref="gml:status" minOccurs="0"/>
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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="history" type="gml:HistoryPropertyType"/>
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	<!-- ===================================== -->
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	<complexType name="HistoryPropertyType">
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		<annotation>
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			<documentation xml:lang="en">The history relationship associates a feature with a sequence of TimeSlice instances.</documentation>
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		</annotation>
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		<sequence maxOccurs="unbounded">
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			<element ref="gml:_TimeSlice"/>
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		</sequence>
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	</complexType>
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	<!-- ================================================================== -->
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	<element name="track" type="gml:TrackType" substitutionGroup="gml:history"/>
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	<!-- ===================================== -->
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	<complexType name="TrackType">
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		<annotation>
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			<documentation xml:lang="en">The track of a moving object is a sequence of specialized timeslices        that indicate the status of the object.</documentation>
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		</annotation>
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		<complexContent>
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			<restriction base="gml:HistoryPropertyType">
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				<sequence maxOccurs="unbounded">
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					<element ref="gml:MovingObjectStatus"/>
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				</sequence>
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			</restriction>
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		</complexContent>
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	</complexType>
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	<!-- ================================================================== -->
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	<group name="dynamicProperties">
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		<sequence>
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			<element ref="gml:validTime" minOccurs="0"/>
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			<element ref="gml:history" minOccurs="0"/>
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			<element ref="gml:dataSource" minOccurs="0"/>
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		</sequence>
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	</group>
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	<!-- ================================================================== -->
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	<complexType name="DynamicFeatureType">
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		<annotation>
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			<documentation>A dynamic feature may possess a history and/or a timestamp.</documentation>
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		</annotation>
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		<complexContent>
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			<extension base="gml:AbstractFeatureType">
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				<group ref="gml:dynamicProperties"/>
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			</extension>
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		</complexContent>
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	</complexType>
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	<!-- ===================================== -->
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	<complexType name="DynamicFeatureCollectionType">
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		<annotation>
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			<documentation>A dynamic feature collection may possess a history and/or a timestamp.</documentation>
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		</annotation>
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		<complexContent>
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			<extension base="gml:FeatureCollectionType">
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				<group ref="gml:dynamicProperties"/>
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			</extension>
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		</complexContent>
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	</complexType>
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	<!-- ===================================== -->
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</schema>