✏ EDIT: RFC1155-SMI.txt

RFC1155-SMI DEFINITIONS ::= BEGIN

EXPORTS -- EVERYTHING
        internet, directory, mgmt,
        experimental, private, enterprises,
        OBJECT-TYPE, ObjectName, ObjectSyntax, SimpleSyntax,
        ApplicationSyntax, NetworkAddress, IpAddress,
        Counter, Gauge, TimeTicks, Opaque;

-- the path to the root

internet      OBJECT IDENTIFIER ::= { iso org(3) dod(6) 1 }

directory     OBJECT IDENTIFIER ::= { internet 1 }

mgmt          OBJECT IDENTIFIER ::= { internet 2 }

experimental  OBJECT IDENTIFIER ::= { internet 3 }

private       OBJECT IDENTIFIER ::= { internet 4 }
 enterprises   OBJECT IDENTIFIER ::= { private 1 }

-- definition of object types

OBJECT-TYPE MACRO ::=
 BEGIN
     TYPE NOTATION ::= "SYNTAX" type (TYPE ObjectSyntax)
                       "ACCESS" Access
                       "STATUS" Status
     VALUE NOTATION ::= value (VALUE ObjectName)

-- names of objects in the MIB

ObjectName ::=
        OBJECT IDENTIFIER

-- syntax of objects in the MIB

ObjectSyntax ::=
        CHOICE {
            simple
                SimpleSyntax,
    -- note that simple SEQUENCEs are not directly
    -- mentioned here to keep things simple (i.e.,
    -- prevent mis-use).  However, application-wide
    -- types which are IMPLICITly encoded simple
    -- SEQUENCEs may appear in the following CHOICE

application-wide
                ApplicationSyntax
        }

SimpleSyntax ::=
           CHOICE {
               number
                   INTEGER,
               string
                   OCTET STRING,
               object
                   OBJECT IDENTIFIER,
               empty
                   NULL
           }

ApplicationSyntax ::=
           CHOICE {
               address
                   NetworkAddress,
               counter
                   Counter,
               gauge
                   Gauge,
               ticks
                   TimeTicks,
               arbitrary
                   Opaque

-- other application-wide types, as they are
       -- defined, will be added here
           }

-- application-wide types

NetworkAddress ::=
           CHOICE {
               internet
                   IpAddress
           }

IpAddress ::=
           [APPLICATION 0]          -- in network-byte order
               IMPLICIT OCTET STRING (SIZE (4))

Counter ::=
           [APPLICATION 1]
               IMPLICIT INTEGER (0..4294967295)

Gauge ::=
           [APPLICATION 2]
               IMPLICIT INTEGER (0..4294967295)

TimeTicks ::=
           [APPLICATION 3]
               IMPLICIT INTEGER (0..4294967295)

Opaque ::=
           [APPLICATION 4]          -- arbitrary ASN.1 value,
               IMPLICIT OCTET STRING   --   "double-wrapped"

END

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