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)

     Access ::= "read-only"

                     | "read-write"

                     | "write-only"

                     | "not-accessible"

     Status ::= "mandatory"

                     | "optional"

                     | "obsolete"

 END

    -- 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