libsmi error bad-identifier-case

Error text: `__' should start with a lower case letter

Reference: RFC 2578 section 3.1

   Within an information module, each macro invocation appears as:

        <descriptor> <macro> <clauses> ::= <value>

   where <descriptor> corresponds to an ASN.1 identifier, <macro> names
   the macro being invoked, and <clauses> and <value> depend on the
   definition of the macro.  (Note that this definition of a descriptor
   applies to all macros defined in this memo and in [2].)

   For the purposes of this specification, an ASN.1 identifier consists
   of one or more letters or digits, and its initial character must be a
   lower-case letter.  Note that hyphens are not allowed by this
   specification (except for use by information modules converted from
   SMIv1 which did allow hyphens).