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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" xmlns:xlink="http://www.w3.org/1999/xlink" elementFormDefault="qualified" version="2.1.2">
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<annotation>
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<appinfo>feature.xsd v2.1.2 2002-07</appinfo>
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<documentation xml:lang="en">
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GML Feature schema. Copyright (c) 2002 OGC, All Rights Reserved.
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</documentation>
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</annotation>
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<!-- include constructs from the GML Geometry schema -->
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<include schemaLocation="geometry.xsd"/>
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<!-- bring in the XLink namespace -->
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<import namespace="http://www.w3.org/1999/xlink" schemaLocation="xlinks.xsd"/>
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<!-- ==============================================================
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global declarations
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=================================================================== -->
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<element name="_Feature" type="gml:AbstractFeatureType" abstract="true"/>
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<element name="_FeatureCollection" type="gml:AbstractFeatureCollectionType" abstract="true" substitutionGroup="gml:_Feature"/>
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<element name="featureMember" type="gml:FeatureAssociationType"/>
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<!-- some basic geometric properties of features -->
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<element name="_geometryProperty" type="gml:GeometryAssociationType" abstract="true"/>
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<element name="geometryProperty" type="gml:GeometryAssociationType"/>
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<element name="boundedBy" type="gml:BoundingShapeType"/>
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<element name="pointProperty" type="gml:PointPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="polygonProperty" type="gml:PolygonPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="lineStringProperty" type="gml:LineStringPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="multiPointProperty" type="gml:MultiPointPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="multiLineStringProperty" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="multiPolygonProperty" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<element name="multiGeometryProperty" type="gml:MultiGeometryPropertyType" substitutionGroup="gml:_geometryProperty"/>
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<!-- common aliases for geometry properties -->
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<element name="location" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>
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<element name="centerOf" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>
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<element name="position" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>
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<element name="extentOf" type="gml:PolygonPropertyType" substitutionGroup="gml:polygonProperty"/>
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<element name="coverage" type="gml:PolygonPropertyType" substitutionGroup="gml:polygonProperty"/>
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<element name="edgeOf" type="gml:LineStringPropertyType" substitutionGroup="gml:lineStringProperty"/>
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<element name="centerLineOf" type="gml:LineStringPropertyType" substitutionGroup="gml:lineStringProperty"/>
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<element name="multiLocation" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>
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<element name="multiCenterOf" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>
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<element name="multiPosition" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>
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<element name="multiCenterLineOf" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:multiLineStringProperty"/>
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<element name="multiEdgeOf" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:multiLineStringProperty"/>
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<element name="multiCoverage" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:multiPolygonProperty"/>
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<element name="multiExtentOf" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:multiPolygonProperty"/>
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<!-- common feature descriptors -->
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<element name="description" type="string"/>
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<element name="name" type="string"/>
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<!-- ==============================================================
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abstract supertypes
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=================================================================== -->
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<complexType name="AbstractFeatureType" abstract="true">
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<annotation>
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<documentation>
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An abstract feature provides a set of common properties. A concrete
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feature type must derive from this type and specify additional
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properties in an application schema. A feature may optionally
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possess an identifying attribute ('fid').
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</documentation>
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</annotation>
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<sequence>
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<element ref="gml:description" minOccurs="0"/>
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<element ref="gml:name" minOccurs="0"/>
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<element ref="gml:boundedBy" minOccurs="0"/>
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<!-- additional properties must be specified in an application schema -->
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</sequence>
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<attribute name="fid" type="ID" use="optional"/>
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</complexType>
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<complexType name="AbstractFeatureCollectionBaseType" abstract="true">
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<annotation>
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<documentation>
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This abstract base type just makes the boundedBy element mandatory
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for a feature collection.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:AbstractFeatureType">
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<sequence>
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<element ref="gml:description" minOccurs="0"/>
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<element ref="gml:name" minOccurs="0"/>
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<element ref="gml:boundedBy"/>
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</sequence>
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<attribute name="fid" type="ID" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="AbstractFeatureCollectionType" abstract="true">
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<annotation>
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<documentation>
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A feature collection contains zero or more featureMember elements.
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</documentation>
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</annotation>
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<complexContent>
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<extension base="gml:AbstractFeatureCollectionBaseType">
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<sequence>
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<element ref="gml:featureMember" minOccurs="0" maxOccurs="unbounded"/>
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</sequence>
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</extension>
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</complexContent>
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</complexType>
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<complexType name="GeometryPropertyType">
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<annotation>
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<documentation>
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A simple geometry property encapsulates a geometry element.
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Alternatively, it can function as a pointer (simple-type link)
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that refers to a remote geometry element.
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</documentation>
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</annotation>
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<sequence minOccurs="0">
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<element ref="gml:_Geometry"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</complexType>
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<complexType name="FeatureAssociationType">
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<annotation>
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<documentation>
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An instance of this type (e.g. a featureMember) can either
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enclose or point to a feature (or feature collection); this
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type can be restricted in an application schema to allow only
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specified features as valid participants in the association.
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When serving as a simple link that references a remote feature
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instance, the value of the gml:remoteSchema attribute can be
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used to locate a schema fragment that constrains the target
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instance.
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</documentation>
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</annotation>
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<sequence minOccurs="0">
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<element ref="gml:_Feature"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</complexType>
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<complexType name="BoundingShapeType">
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<annotation>
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<documentation>
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Bounding shapes--a Box or a null element are currently allowed.
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</documentation>
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</annotation>
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<sequence>
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<choice>
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<element ref="gml:Box"/>
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<element name="null" type="gml:NullType"/>
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</choice>
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</sequence>
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</complexType>
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<!-- ==============================================================
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geometry properties
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=================================================================== -->
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<complexType name="PointPropertyType">
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<annotation>
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<documentation>
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Encapsulates a single point to represent position, location, or
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centerOf properties.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:Point"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="PolygonPropertyType">
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<annotation>
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<documentation>
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Encapsulates a single polygon to represent coverage or extentOf
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properties.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:Polygon"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="LineStringPropertyType">
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<annotation>
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<documentation>
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Encapsulates a single LineString to represent centerLineOf or
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edgeOf properties.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:LineString"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="MultiPointPropertyType">
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<annotation>
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<documentation>
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Encapsulates a MultiPoint element to represent the following
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discontiguous geometric properties: multiLocation, multiPosition,
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multiCenterOf.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:MultiPoint"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="MultiLineStringPropertyType">
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<annotation>
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<documentation>
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Encapsulates a MultiLineString element to represent the following
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discontiguous geometric properties: multiEdgeOf, multiCenterLineOf.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:MultiLineString"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="MultiPolygonPropertyType">
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<annotation>
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<documentation>
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Encapsulates a MultiPolygon to represent the following discontiguous
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geometric properties: multiCoverage, multiExtentOf.
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</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:MultiPolygon"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<complexType name="MultiGeometryPropertyType">
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<annotation>
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<documentation>Encapsulates a MultiGeometry element.</documentation>
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</annotation>
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<complexContent>
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<restriction base="gml:GeometryAssociationType">
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<sequence minOccurs="0">
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<element ref="gml:MultiGeometry"/>
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</sequence>
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<attributeGroup ref="xlink:simpleLink"/>
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<attribute ref="gml:remoteSchema" use="optional"/>
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</restriction>
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</complexContent>
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</complexType>
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<simpleType name="NullType">
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<annotation>
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<documentation>
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If a bounding shape is not provided for a feature collection,
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explain why. Allowable values are:
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innapplicable - the features do not have geometry
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unknown - the boundingBox cannot be computed
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unavailable - there may be a boundingBox but it is not divulged
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missing - there are no features
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</documentation>
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</annotation>
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<restriction base="string">
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<enumeration value="inapplicable"/>
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<enumeration value="unknown"/>
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<enumeration value="unavailable"/>
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<enumeration value="missing"/>
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</restriction>
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</simpleType>
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</schema>
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