<xsd:complexType name="SecondDefiningParameterType" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:annotation>
        <xsd:documentation>Definition of the second parameter which defines the shape of an ellipsoid. An ellipsoid requires two defining parameters: semi-major axis and inverse flattening or semi-major axis and semi-minor axis. When the reference body is a sphere rather than an ellipsoid, only a single defining parameter is required, namely the radius of the sphere; in that case, the semi-major axis "degenerates" into the radius of the sphere.</xsd:documentation>
    </xsd:annotation>
    <xsd:choice>
        <xsd:element name="inverseFlattening" type="gml:ScaleType">
            <xsd:annotation>
                <xsd:documentation>Inverse flattening value of the ellipsoid. </xsd:documentation>
            </xsd:annotation>
        </xsd:element>
        <xsd:element name="semiMinorAxis" type="gml:LengthType">
            <xsd:annotation>
                <xsd:documentation>Length of the semi-minor axis of the ellipsoid. </xsd:documentation>
            </xsd:annotation>
        </xsd:element>
        <xsd:element name="isSphere">
            <xsd:annotation>
                <xsd:documentation>The ellipsoid is degenerate and is actually a sphere. The sphere is completely defined by the semi-major axis, which is the radius of the sphere. </xsd:documentation>
            </xsd:annotation>
            <xsd:simpleType>
                <xsd:restriction base="string">
                    <xsd:enumeration value="Sphere" />
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:element>
    </xsd:choice>
</xsd:complexType>

• SecondDefiningParameterType
• gml:SecondDefiningParameter