<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>