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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="3.1.1.2">
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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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GML is an OGC Standard.
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Copyright (c) 2001,2005,2010 Open Geospatial Consortium.
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To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
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</documentation>
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</annotation>
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<!-- =================================================================== -->
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<!-- === includes and imports ============================================ -->
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<include schemaLocation="gml.xsd"/>
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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>
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