A unique identification of a vessel according to IMO resolution A.600(15). It is made of the three letters “IMO” in front of the Lloyd’s Register number. This is a unique seven digit number that
is assigned to propelled, sea-going merchant ships of 100 GT and above upon keel laying (with some exceptions), see:

    IACS Procedural Requirements No. 11, IACS Procedure for Assigning Date of Build, 1996

        Information on IMO ship identification number scheme on the web site of the IMO (last visited: 2005-09-05)

<xs:attribute name="numberIMO" use="required">
    <xs:annotation>
        <xs:documentation>
            <p>A unique identification of a vessel according to IMO resolution A.600(15). It is made of the three letters “IMO” in front of the Lloyd’s Register number. This is a unique seven digit number that
						is assigned to propelled, sea-going merchant ships of 100 GT and above upon keel laying (with some exceptions), see:
						<ul><li>IACS Procedural Requirements No. 11, IACS Procedure for Assigning Date of Build, 1996</li>
                    <li>
                        <a href="http://www.imo.org/Facilitation/mainframe.asp?topic_id=388">Information on IMO ship identification number scheme on the web site of the IMO (last visited: 2005-09-05)</a>
                    </li>
                </ul>
            </p>
        </xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:string">
            <xs:pattern value="\d{7}" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>