<?xml version="1.0" encoding="UTF-8"?>
<!-- File: feature.xsd -->
<schema targetNamespace="http://www.opengis.net/gml"
xmlns:gml="http://www.opengis.net/gml"
xmlns="http://www.w3.org/2000/10/XMLSchema"
elementFormDefault="qualified"
version="2.06">
<annotation>
<appinfo>feature.xsd v2.06 2001-02</appinfo>
<documentation xml:lang="en">
GML Feature schema. Copyright (c) 2001 OGC, All Rights Reserved.
</documentation>
</annotation>
<!-- include constructs from the GML Geometry schema -->
<include schemaLocation="geometry.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:GeometryPropertyType"
abstract="true"/>
<element name="geometryProperty" type="gml:GeometryPropertyType" />
<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="gml:AssociationAttributeGroup"/>
</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="gml:AssociationAttributeGroup"/>
</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:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:Point"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</restriction>
</complexContent>
</complexType>
<complexType name="PolygonPropertyType">
<annotation>
<documentation>
Encapsulates a single polygon to represent coverage or extentOf
properties.
</documentation>
</annotation>
<complexContent>
<restriction base="gml:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:Polygon"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</restriction>
</complexContent>
</complexType>
<complexType name="LineStringPropertyType">
<annotation>
<documentation>
Encapsulates a single LineString to represent centerLineOf or
edgeOf properties.
</documentation>
</annotation>
<complexContent>
<restriction base="gml:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:LineString"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</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:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:MultiPoint"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</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:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:MultiLineString"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</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:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:MultiPolygon"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</restriction>
</complexContent>
</complexType>
<complexType name="MultiGeometryPropertyType">
<annotation>
<documentation>Encapsulates a MultiGeometry element.
</documentation>
</annotation>
<complexContent>
<restriction base="gml:GeometryPropertyType">
<sequence minOccurs="0">
<element ref="gml:MultiGeometry"/>
</sequence>
<attributeGroup ref="gml:AssociationAttributeGroup"/>
</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>
