<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    
    <xs:annotation>
        <xs:documentation xml:lang="en">
            Jeospace utility types and elements
        </xs:documentation>
    </xs:annotation>
    
    <xs:attribute name="id" type="xs:token"/>
    <xs:attribute name="name" type="xs:token"/>
    <xs:attribute name="num" type="xs:token"/>
    <xs:attribute name="type" type="xs:token"/>
    <xs:attribute name="bfd" type="xs:token"/>
    <xs:attribute name="hr" type="xs:token"/>
    
    <xs:element name="Identification">
        <xs:complexType>
            <xs:attribute ref="id" use="required"/>
            <xs:attribute ref="name"/>
            <xs:attribute ref="num"/>
            <xs:attribute ref="type"/>
            <xs:attribute ref="bfd"/>
            <xs:attribute ref="hr"/>
        </xs:complexType>
    </xs:element>
    
    <xs:attribute name="system" type="xs:token"/>
    <xs:attribute name="frame" type="xs:token"/>
    <xs:attribute name="platform" type="xs:token"/>
    
    <xs:element name="ReferenceFrame">
        <xs:complexType>
            <xs:attribute ref="system" use="required"/>
            <xs:attribute ref="frame"/>
            <xs:attribute ref="platform"/>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="URL">
        <xs:complexType>
            <xs:attribute name="value" type="xs:anyURI"/>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="class">
        <xs:complexType>
            <xs:attribute name="value" type="xs:token"/>
        </xs:complexType>
    </xs:element>

</xs:schema>