ASN.1 Predefined Types

The 16 Universal Types are defined in ISO/CCITT X/409. These types, shown in #tbt72#1619> form the basic elements from which all other ASN.1 constructions can be defined.

Table: ASN.1 Predefined Types

ID Codes 0, 16 and 17 are ;SPM_quot;special;SPM_quot;

These are the Backus-Naur Form (BNF) representations of the basic rules for constructing and Reading ASN.1 specifications. You must be careful to distinguish between: