<xs:element name="Surfaces">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="Surface" minOccurs="0" maxOccurs="unbounded">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="Definition" minOccurs="0">
                            <xs:complexType>
                                <xs:sequence>
                                    <xs:element name="Pnts">
                                        <xs:complexType>
                                            <xs:sequence>
                                                <xs:element name="P" minOccurs="0" maxOccurs="unbounded">
                                                    <xs:complexType>
                                                        <xs:simpleContent>
                                                            <xs:extension base="xs:string">
                                                                <xs:attribute name="id" type="xs:short" />
                                                            </xs:extension>
                                                        </xs:simpleContent>
                                                    </xs:complexType>
                                                </xs:element>
                                            </xs:sequence>
                                        </xs:complexType>
                                    </xs:element>
                                    <xs:element name="Faces">
                                        <xs:complexType>
                                            <xs:sequence>
                                                <xs:element name="F" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                            </xs:sequence>
                                        </xs:complexType>
                                    </xs:element>
                                </xs:sequence>
                                <xs:attribute name="surfType" type="xs:string" />
                            </xs:complexType>
                        </xs:element>
                        <xs:element name="SourceData">
                            <xs:complexType>
                                <xs:sequence>
                                    <xs:element name="Boundaries">
                                        <xs:complexType>
                                            <xs:sequence>
                                                <xs:element name="Boundary" minOccurs="0" maxOccurs="unbounded">
                                                    <xs:complexType>
                                                        <xs:sequence>
                                                            <xs:element name="PntList3D" type="xs:string" />
                                                        </xs:sequence>
                                                        <xs:attribute name="bndType" type="xs:string" />
                                                    </xs:complexType>
                                                </xs:element>
                                            </xs:sequence>
                                        </xs:complexType>
                                    </xs:element>
                                    <xs:element name="Breaklines" minOccurs="0">
                                        <xs:complexType>
                                            <xs:sequence>
                                                <xs:element name="Breakline" minOccurs="0" maxOccurs="unbounded">
                                                    <xs:complexType>
                                                        <xs:sequence>
                                                            <xs:element name="PntList2D" type="xs:string" />
                                                        </xs:sequence>
                                                        <xs:attribute name="name" type="xs:string" />
                                                        <xs:attribute name="desc" type="xs:string" />
                                                    </xs:complexType>
                                                </xs:element>
                                            </xs:sequence>
                                        </xs:complexType>
                                    </xs:element>
                                </xs:sequence>
                            </xs:complexType>
                        </xs:element>
                    </xs:sequence>
                    <xs:attribute name="name" type="xs:string" />
                </xs:complexType>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="name" type="xs:string" />
    </xs:complexType>
</xs:element>