<xs:element name="Vessel" >
  <xs:annotation>
    <xs:documentation>Identifying details of the vessel and voyage.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="vesselName"/>
      <xs:element minOccurs="0" name="carrier" type="xs:string">
        <xs:annotation>
          <xs:documentation>Carrier Name. e.g. - APL </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element minOccurs="0" name="vesselFunction">
        <xs:annotation>
          <xs:documentation>Feeder or Main Vessel</xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:enumeration value="Feeder"/>
            <xs:enumeration value="Main"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>