- This is the official ID of the sponsoring entity:
1. if the sponsor is a Resident, then use the File Number of the resident
2. if the sponsor is a Citizen, then use the UID of the Citizen
3. if the sponsor is an Establishment, then use the Establishment Code
4. if the sponsor is on an Investor Visa, then use their File Number (for MemberType = 4,5), else the UID.

<xs:simpleType name="EstablishmentEntityID">
    <xs:annotation>
        <xs:documentation>
        - This is the official ID of the sponsoring entity:
        1. if the sponsor is a Resident, then use the File Number of the resident
        2. if the sponsor is a Citizen, then use the UID of the Citizen
        3. if the sponsor is an Establishment, then use the Establishment Code
        4. if the sponsor is on an Investor Visa, then use their File Number (for MemberType = 4,5), else the UID.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base="xs:string">
        <xs:maxLength value="50" />
    </xs:restriction>
</xs:simpleType>