http://www.rfc-editor.org/rfc/rfc1444.txt
RFC 1444: Conformance Statements for version 2 of the Simple Network Management Protocol (SNMPv2), J. Case, K. McCloghrie, M. Rose, S. Waldbusser1993-04-01T23:00:00-00:00It may be useful to define the acceptable lower-bounds of implementation, along with the actual level of implementation achieved. It is the purpose of this document to define the notation used for these purposes. [STANDARDS-TRACK]