<xs:complexType name="SewerSystemAttributeType">
<xs:sequence>
<xs:element name="startLocation" minOccurs="0" type="xs:string"/>
<xs:element name="endLocation" minOccurs="0" type="xs:string"/>
<xs:element name="systemType" minOccurs="0" type="gml:CodeType"/>
<xs:element name="drainageArea" minOccurs="0" type="gml:StringOrRefType"/>
</xs:sequence>
</xs:complexType>