ASN.1 value format

The value format is based on an ASN.1 module, as shown in the following example.

    A ::= INTEGER
 
    a INTEGER ::= 1
    b INTEGER ::= 2
    c INTEGER ::= 3
    d A       ::= 4
 
    B ::= SET {
       f   [1] INTEGER,
       g   [2] INTEGER,
       h   [3] INTEGER
       }
    C ::= SEQUENCE {
       f   [1] INTEGER,
       g   [2] INTEGER,
       h   [3] INTEGER
       }
 
Values for A may be specified as:
        a
        b
        d
        12
Values for B may be specified as:
        (f a, h d, g 34)
        (h 138, f d, g 34)
Values for C may be specified as:
        (c, 12, 19)
        (f c, 12, h 19)
        (f c, g 12, h 19)

The application program can specify a, b, c, or d as the <value> portion of a <label> <value> pair. If the value appears in a context that might be ambiguous, such as for the value of the g field in the SET B, the appropriate <label> must accompany the <value>. The labels can be omitted when specifying values for C, because there is no ambiguity. The labels can never be omitted when specifying values for B, because A is optional and without a label for B, it is not possible to determine whether the value is for A or B.

CMIP services, using information from the compiled ASN.1 modules, verifies that the value and type are compatible.