dwc/docs/xml/tdwg_dwc_extensions.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema version="2014-11-08" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://rs.tdwg.org/dwc/terms/"
    xmlns:simple="http://rs.tdwg.org/dwc/xsd/simpledarwincore/"
    xmlns:dwc="http://rs.tdwg.org/dwc/terms/">
    <xs:include schemaLocation="tdwg_dwcterms.xsd"/>
    <xs:import namespace="http://rs.tdwg.org/dwc/xsd/simpledarwincore/" schemaLocation="tdwg_dwc_simple.xsd"/>
    
    <xs:annotation>
        <xs:documentation>
            This schema defines extension classes to the Simple Darwin Core record schema. 
        </xs:documentation>
    </xs:annotation>

    <!-- MEASUREMENTORFACT -->
    <xs:element name="MeasurementOrFact" substitutionGroup="simple:anyExtension">
        <xs:complexType>
            <xs:all>
                <xs:element ref="dwc:measurementID" minOccurs="0"/>
                <xs:element ref="dwc:measurementType" minOccurs="1"/>
                <xs:element ref="dwc:measurementValue" minOccurs="1"/>
                <xs:element ref="dwc:measurementAccuracy" minOccurs="0"/>
                <xs:element ref="dwc:measurementUnit" minOccurs="0"/>
                <xs:element ref="dwc:measurementDeterminedBy" minOccurs="0"/>
                <xs:element ref="dwc:measurementDeterminedDate" minOccurs="0"/>
                <xs:element ref="dwc:measurementMethod" minOccurs="0"/>
                <xs:element ref="dwc:measurementRemarks" minOccurs="0"/>
            </xs:all>
        </xs:complexType>
    </xs:element>
    
    <!-- RESOURCE RELATIONSHIP -->
    <xs:element name="ResourceRelationship" substitutionGroup="simple:anyExtension">
        <xs:complexType>
            <xs:all>
                <xs:element ref="dwc:resourceRelationshipID" minOccurs="0"/>
                <xs:element ref="dwc:relatedResourceID" minOccurs="1"/>
                <xs:element ref="dwc:relationshipOfResource" minOccurs="1"/>
                <xs:element ref="dwc:relationshipAccordingTo" minOccurs="0"/>
                <xs:element ref="dwc:relationshipEstablishedDate" minOccurs="0"/>
                <xs:element ref="dwc:relationshipRemarks" minOccurs="0"/>
            </xs:all>
        </xs:complexType>
    </xs:element>
    
</xs:schema>