For example, there are many 'enum value_PR' and 'struct value' generated if
a class is instantiated as many instances.

typedef enum value_PR {
    value_PR_NOTHING,    /* No components present */
    .....
} value_PR;

typedef struct ProtocolIE_Field_6563P5 {
    ....
    struct value {
        value_PR present;
        union value_u {
        } choice;

        /* Context for parsing across buffer boundaries */
        asn_struct_ctx_t _asn_ctx;
    } value;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
} ProtocolIE_Field_6563P5_t;