dwc/tdwg_gml.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!-- ==================================================================== -->
<!-- Introduction                                                         -->
<!-- ==================================================================== -->
<!-- TDWG Simple GML Profile                                              -->
<!-- The following schema document contains only those element            -->
<!-- declarations from GML that are required to validate a GML            -->
<!-- application schema that complies with this profile.                  -->
<!-- GML application schemas can ensure compliance with this profile by   -->
<!-- importing this schema document rather than schema documents from the -->
<!-- standard GML 3.1.1 distribution.                                     -->
<!-- History:                                                             -->
<!--   version 0.5 2007-02-14 P. Dibner, J. Wieczorek, J. de la Torre     -->
<!-- Status:                                                              -->
<!--   Ready for testing.                                                 -->
<!--   CircleByCenterPoint doesn't currently validate importing only      -->
<!--   gml:geometryPrimitives, geometryAggregates, feature. Fix this and  -->
<!--   remove full gml import.                                            -->
<!--   See http://wiki.tdwg.org for current status of this standard.      -->
<!-- ==================================================================== -->
<!-- Schema                                                               -->
<!-- JRW: As a profile, this namespace should substitute for gml          -->
<!-- ==================================================================== -->
<xs:schema 
    targetNamespace="http://rs.tdwg.org/dwc/tdwggml" 
    xmlns="http://rs.tdwg.org/dwc/tdwggml"
    xmlns:tdwggml="http://rs.tdwg.org/dwc/tdwggml" 
    xmlns:gml="http://www.opengis.net/gml"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    elementFormDefault="qualified" 
    version="0.5">

    <!-- ============================================================== -->
    <!-- Includes                                                       -->
    <!-- ============================================================== -->
    <xs:include schemaLocation="http://rs.tdwg.org/dwc/tdwg_basetypes.xsd"/>

    <!-- ============================================================== -->
    <!-- Imports                                                        -->
    <!-- ============================================================== -->
<!--    <xs:import namespace="http://www.opengis.net/gml"
        schemaLocation="http://schemas.opengis.net/gml/3.1.1/base/gml.xsd"/>
-->
    <!-- JRW: Import only the minimal subset of gml required to support tdwg spatial vocabulary. -->
    <xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/3.1.1/base/feature.xsd"/>
    <xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/3.1.1/base/geometryPrimitives.xsd"/>
    <xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/3.1.1/base/geometryAggregates.xsd"/>


    <!-- ============================================================== -->
    <!-- Elements                                                       -->
    <!-- ============================================================== -->
    <!-- Collection Location Geometric Properties -->
    <!-- In the examples below, dimension is assumed to be 2 and the coordinate reference system is assumed to be understood.  However, other choices can be made per the GML specification. -->

    <xs:element name="LocationPointRadius" type="pointRadiusType" substitutionGroup="gml:_Feature"
        nillable="true"/>

    <xs:element name="LocationFootprint" type="footprintType" substitutionGroup="gml:_Feature"
        nillable="true"/>

    <xs:element name="OccurrenceFeature" type="OccurrenceFeatureType"/>


    <!-- ============================================================== -->
    <!-- Types      			                                    -->
    <!-- ============================================================== -->

    <xs:complexType name="pointRadiusType">
        <!-- The point-radius feature type is meant to be able to capture the point-radius 
            representation of a place as described in Wieczorek et al. (IJGIS 18:8 pp745-767). 
            This representation uses a point for the centroid of the geometry describing the 
            place within which an event is thought to have occurred, and a distance from that 
            point to the furthest point describing that underlying geometry. -->
        <xs:complexContent>
            <xs:extension base="gml:AbstractFeatureType">
                <xs:sequence>
                    <xs:element name="PointRadius" type="gml:CircleByCenterPointType" minOccurs="0"
                        maxOccurs="1"/>
                    <xs:element name="PointRadiusSpatialFit" type="spatialFitDataType" minOccurs="0"
                        maxOccurs="1"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="footprintType">
        <!-- The footprint feature type allows the location to be represented by points, lines,
            polygons, curves, or a collection of any of these geometry types. -->
        <xs:complexContent>
            <xs:extension base="gml:AbstractFeatureType">
                <xs:sequence>
                    <xs:element name="FootprintGeometry" type="gml:MultiGeometryPropertyType"
                        minOccurs="0" maxOccurs="1"/>
                    <!-- The footprint geometry holds the collection of encoded geometry objects used 
                        to describe the location. This footprint may be different from the original 
                        spatial representation of the location. For example, the data provider may 
                        represent point locations as the one-degree grid cell in which the point lies. -->
                    <xs:element name="FootprintSpatialFit" type="spatialFitDataType" minOccurs="0"
                        maxOccurs="1"/>
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <!-- OccurrenceLocationType -->
    <xs:complexType name="OccurrenceFeatureType">
        <xs:complexContent>
            <xs:extension base="gml:AbstractFeatureType">
                <xs:sequence>
                    <xs:element ref="LocationPointRadius" minOccurs="0"/>
                    <xs:element ref="LocationFootprint" minOccurs="0"/>
                    <!-- NB: any GML element substitutable for gml:_Geometry can be added to this list or in an extension. -->
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

</xs:schema>