<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    
    <xs:include schemaLocation="measure.xsd"/>
    <xs:include schemaLocation="util.xsd"/>
    <xs:include schemaLocation="coordinate.xsd"/>
    <xs:include schemaLocation="value.xsd"/>
    
    <xs:annotation>
        <xs:documentation xml:lang="en">
            Jeospace x3d elements
        </xs:documentation>
    </xs:annotation>
    
    <xs:simpleType name="normalizedNonNegativeFloatType">
        <xs:restriction base="xs:float">
            <xs:minInclusive value="0.0"/>
            <xs:maxInclusive value="1.0"/>
        </xs:restriction>
    </xs:simpleType>
    
    <xs:element name="Inline">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="scale"/>
                <xs:element ref="URL"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="ColorCode">
        <xs:complexType>
            <xs:attribute name="r" type="normalizedNonNegativeFloatType" use="required"/>
            <xs:attribute name="g" type="normalizedNonNegativeFloatType" use="required"/>
            <xs:attribute name="b" type="normalizedNonNegativeFloatType" use="required"/>
        </xs:complexType>
    </xs:element>
    
    <xs:complexType name="x3dPrimativeGeometryType">
        <xs:sequence>
            <xs:element ref="scale"/>
            <xs:element ref="ColorCode"/>
        </xs:sequence>
        <xs:attribute name="sensor" type="xs:boolean" default="true"/>
    </xs:complexType>
    
    <xs:element name="Box" type="x3dPrimativeGeometryType"/>
    <xs:element name="Cone" type="x3dPrimativeGeometryType"/>
    <xs:element name="Sphere" type="x3dPrimativeGeometryType"/>
    
    <xs:complexType name="fieldOfViewType">
        <xs:attribute name="fov" type="xs:token"/>
    </xs:complexType>
    
    <xs:element name="PlatformComponent">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="ReferenceFrame"/>
                <xs:choice>
                    <xs:element ref="Inline"/>
                    <xs:element ref="Box"/>
                    <xs:element ref="Cone"/>
                    <xs:element ref="Sphere"/>
                    <xs:element name="coverage" type="fieldOfViewType"/>
                </xs:choice>
            </xs:sequence>
            <xs:attribute name="name" type="xs:token"/>
            <xs:attribute name="type" type="xs:token"/>
            <xs:attribute name="displayStatus" type="xs:boolean" default="true"/>
        </xs:complexType>
    </xs:element>
    
    <xs:simpleType name="spectralColorType">
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="M"/>
            <xs:enumeration value="K"/>
            <xs:enumeration value="G"/>
            <xs:enumeration value="F"/>
            <xs:enumeration value="A"/>
            <xs:enumeration value="B"/>
            <xs:enumeration value="O"/>
        </xs:restriction>
    </xs:simpleType>
    
    <xs:complexType name="spectralColorValueType">
        <xs:attribute name="value" type="spectralColorType"/>
    </xs:complexType>
    
    <xs:element name="star">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="Identification"/>
                <xs:element ref="Cartesian"/>
                <xs:element name="mag" type="doubleValueType"/>
                <xs:element name="spectralType" type="spectralColorValueType"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="starField">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="star" maxOccurs="unbounded"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="SystemComponent">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="ReferenceFrame"/>
                <xs:choice>
                    <xs:element ref="Inline"/>
                    <xs:element ref="Box"/>
                    <xs:element ref="Cone"/>
                    <xs:element ref="Sphere"/>
                    <xs:element ref="starField"/>
                </xs:choice>
            </xs:sequence>
            <xs:attribute name="name" type="xs:token"/>
            <xs:attribute name="type" type="xs:token"/>
            <xs:attribute name="displayStatus" type="xs:boolean" default="true"/>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="pos">
        <xs:complexType>
            <xs:sequence>
                <xs:choice>
                    <xs:element ref="Cartesian"/>
                    <xs:element ref="Spherical"/>
                    <xs:element ref="Ellipsoidal"/>
                </xs:choice>
            </xs:sequence>
            <xs:attribute name="name" type="xs:token"/>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="orient">
        <xs:complexType>
            <xs:sequence>
                    <xs:element ref="Attitude"/>
            </xs:sequence>
            <xs:attribute name="name" type="xs:token"/>
        </xs:complexType>
    </xs:element>
    
    <xs:element name="Viewpoint">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="ReferenceFrame"/>
                <xs:element ref="pos"/>
                <xs:element ref="orient"/>
            </xs:sequence>
            <xs:attribute name="name" type="xs:token"/>
            <xs:attribute name="displayStatus" type="xs:boolean" default="true"/>
        </xs:complexType>
    </xs:element>
    
</xs:schema>