MIB architecture

I am trying to import some MIBs for a 3COM switch into my SNMP administrator. It is sometimes the case that the ucdavis library hits an error which causes the entire mib to be discarded. I am new to the structure of MIBs and I was hoping someone could help me decipher what was wrong. I believe the error is somewhere in the text below.

-- ==================================================================
--
-- Varibles and types be imported
--
-- ==================================================================
A3COM-HUAWEI-DEVICE-MIB DEFINITIONS ::= BEGIN
IMPORTS
    DisplayString, DateAndTime
        FROM SNMPv2-TC

    MODULE-IDENTITY,OBJECT-TYPE,IpAddress
        FROM SNMPv2-SMI
    lswCommon
        FROM A3COM-HUAWEI-OID-MIB;

-------------------------------------------------------------------------------
-- Object Identifiers
-------------------------------------------------------------------------------
--Enterprise ID
A3COM                           OBJECT IDENTIFIER ::= { enterprises    534   }

Any advice would be greatly appreciated.
-JH

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