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<?xml version="1.0" encoding="UTF-8"?>

<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">

  <annotation>

    <appinfo>feature.xsd v2.1.2 2002-07</appinfo>

    <documentation xml:lang="en">

      GML Feature schema. Copyright (c) 2002 OGC, All Rights Reserved.

    </documentation>

  </annotation>

  <!-- include constructs from the GML Geometry schema -->

  <include schemaLocation="geometry.xsd"/>

  <!-- bring in the XLink namespace -->

 <import namespace="http://www.w3.org/1999/xlink" schemaLocation="../../xlink/1.0.0/xlinks.xsd"/>

  <!-- ==============================================================

       global declarations

  =================================================================== -->

  <element name="_Feature" type="gml:AbstractFeatureType" abstract="true"/>

  <element name="_FeatureCollection" type="gml:AbstractFeatureCollectionType" abstract="true" substitutionGroup="gml:_Feature"/>

  <element name="featureMember" type="gml:FeatureAssociationType"/>

  <!-- some basic geometric properties of features -->

  <element name="_geometryProperty" type="gml:GeometryAssociationType" abstract="true"/>

  <element name="geometryProperty" type="gml:GeometryAssociationType"/>

  <element name="boundedBy" type="gml:BoundingShapeType"/>

  <element name="pointProperty" type="gml:PointPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="polygonProperty" type="gml:PolygonPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="lineStringProperty" type="gml:LineStringPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="multiPointProperty" type="gml:MultiPointPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="multiLineStringProperty" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="multiPolygonProperty" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <element name="multiGeometryProperty" type="gml:MultiGeometryPropertyType" substitutionGroup="gml:_geometryProperty"/>

  <!-- common aliases for geometry properties -->

  <element name="location" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>

  <element name="centerOf" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>

  <element name="position" type="gml:PointPropertyType" substitutionGroup="gml:pointProperty"/>

  <element name="extentOf" type="gml:PolygonPropertyType" substitutionGroup="gml:polygonProperty"/>

  <element name="coverage" type="gml:PolygonPropertyType" substitutionGroup="gml:polygonProperty"/>

  <element name="edgeOf" type="gml:LineStringPropertyType" substitutionGroup="gml:lineStringProperty"/>

  <element name="centerLineOf" type="gml:LineStringPropertyType" substitutionGroup="gml:lineStringProperty"/>

  <element name="multiLocation" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>

  <element name="multiCenterOf" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>

  <element name="multiPosition" type="gml:MultiPointPropertyType" substitutionGroup="gml:multiPointProperty"/>

  <element name="multiCenterLineOf" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:multiLineStringProperty"/>

  <element name="multiEdgeOf" type="gml:MultiLineStringPropertyType" substitutionGroup="gml:multiLineStringProperty"/>

  <element name="multiCoverage" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:multiPolygonProperty"/>

  <element name="multiExtentOf" type="gml:MultiPolygonPropertyType" substitutionGroup="gml:multiPolygonProperty"/>

  <!-- common feature descriptors -->

  <element name="description" type="string"/>

  <element name="name" type="string"/>

  <!-- ==============================================================

       abstract supertypes

  =================================================================== -->

  <complexType name="AbstractFeatureType" abstract="true">

    <annotation>

      <documentation>

        An abstract feature provides a set of common properties. A concrete 

        feature type must derive from this type and specify additional 

        properties in an application schema. A feature may optionally 

        possess an identifying attribute ('fid').

      </documentation>

    </annotation>

    <sequence>

      <element ref="gml:description" minOccurs="0"/>

      <element ref="gml:name" minOccurs="0"/>

      <element ref="gml:boundedBy" minOccurs="0"/>

      <!-- additional properties must be specified in an application schema -->

    </sequence>

    <attribute name="fid" type="ID" use="optional"/>

  </complexType>

  <complexType name="AbstractFeatureCollectionBaseType" abstract="true">

    <annotation>

      <documentation>

        This abstract base type just makes the boundedBy element mandatory 

        for a feature collection.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:AbstractFeatureType">

        <sequence>

          <element ref="gml:description" minOccurs="0"/>

          <element ref="gml:name" minOccurs="0"/>

          <element ref="gml:boundedBy"/>

        </sequence>

        <attribute name="fid" type="ID" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="AbstractFeatureCollectionType" abstract="true">

    <annotation>

      <documentation>

        A feature collection contains zero or more featureMember elements.

      </documentation>

    </annotation>

    <complexContent>

      <extension base="gml:AbstractFeatureCollectionBaseType">

        <sequence>

          <element ref="gml:featureMember" minOccurs="0" maxOccurs="unbounded"/>

        </sequence>

      </extension>

    </complexContent>

  </complexType>

  <complexType name="GeometryPropertyType">

		<annotation>

			<documentation>

        A simple geometry property encapsulates a geometry element.

        Alternatively, it can function as a pointer (simple-type link) 

        that refers to a remote geometry element.

      </documentation>

		</annotation>

		<sequence minOccurs="0">

			<element ref="gml:_Geometry"/>

		</sequence>

		<attributeGroup ref="xlink:simpleLink"/>

             <attribute ref="gml:remoteSchema" use="optional"/>

  </complexType>

  <complexType name="FeatureAssociationType">

    <annotation>

      <documentation>

        An instance of this type (e.g. a featureMember) can either 

        enclose or point to a feature (or feature collection); this 

        type can be restricted in an application schema to allow only 

        specified features as valid participants in the association. 

        When serving as a simple link that references a remote feature 

        instance, the value of the gml:remoteSchema attribute can be 

        used to locate a schema fragment that constrains the target 

        instance.

      </documentation>

    </annotation>

    <sequence minOccurs="0">

      <element ref="gml:_Feature"/>

    </sequence>

    <attributeGroup ref="xlink:simpleLink"/>

    <attribute ref="gml:remoteSchema" use="optional"/>

  </complexType>

  <complexType name="BoundingShapeType">

    <annotation>

      <documentation>

        Bounding shapes--a Box or a null element are currently allowed.

      </documentation>

    </annotation>

    <sequence>

      <choice>

        <element ref="gml:Box"/>

        <element name="null" type="gml:NullType"/>

      </choice>

    </sequence>

  </complexType>

  <!-- ==============================================================

       geometry properties

  =================================================================== -->

  <complexType name="PointPropertyType">

    <annotation>

      <documentation>

        Encapsulates a single point to represent position, location, or 

        centerOf properties.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:Point"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="PolygonPropertyType">

    <annotation>

      <documentation>

        Encapsulates a single polygon to represent coverage or extentOf 

        properties.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:Polygon"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="LineStringPropertyType">

    <annotation>

      <documentation>

        Encapsulates a single LineString to represent centerLineOf or 

        edgeOf properties.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:LineString"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="MultiPointPropertyType">

    <annotation>

      <documentation>

        Encapsulates a MultiPoint element to represent the following 

        discontiguous geometric properties: multiLocation, multiPosition, 

        multiCenterOf.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:MultiPoint"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="MultiLineStringPropertyType">

    <annotation>

      <documentation>

        Encapsulates a MultiLineString element to represent the following 

        discontiguous geometric properties: multiEdgeOf, multiCenterLineOf.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:MultiLineString"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="MultiPolygonPropertyType">

    <annotation>

      <documentation>

        Encapsulates a MultiPolygon to represent the following discontiguous 

        geometric properties: multiCoverage, multiExtentOf.

      </documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:MultiPolygon"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <complexType name="MultiGeometryPropertyType">

    <annotation>

      <documentation>Encapsulates a MultiGeometry element.</documentation>

    </annotation>

    <complexContent>

      <restriction base="gml:GeometryAssociationType">

        <sequence minOccurs="0">

          <element ref="gml:MultiGeometry"/>

        </sequence>

        <attributeGroup ref="xlink:simpleLink"/>

        <attribute ref="gml:remoteSchema" use="optional"/>

      </restriction>

    </complexContent>

  </complexType>

  <simpleType name="NullType">

    <annotation>

      <documentation>

        If a bounding shape is not provided for a feature collection, 

        explain why. Allowable values are:

        innapplicable - the features do not have geometry

        unknown - the boundingBox cannot be computed

        unavailable - there may be a boundingBox but it is not divulged

        missing - there are no features

      </documentation>

    </annotation>

    <restriction base="string">

      <enumeration value="inapplicable"/>

      <enumeration value="unknown"/>

      <enumeration value="unavailable"/>

      <enumeration value="missing"/>

    </restriction>

  </simpleType>

</schema>