ASN.1 Type Notation (2/3)

 - Tag
  * 모든 Type 은 Tag 값을 가진다
  * Tag는 직접 또는 간접적으로 Type 값을 식별 함
  * Tag는 유일한 필요 없음
  * Tag 구성
    - Class와 Tag Number로 구성 : [[class] tag#]
    - Class : Universal, Application, Private, Context-Specific
    - Tag Number : non-negative integer
  * Class
     - Universal
         * Built-in Types, Application independent types
         * X.208에 정의 된 Type에 대한 class
     - Application
         * Application specific types ( such as X.500 directory services )
     - Private
         * Defined by users and not covered by and standard
     - Context-specific
          * For types whoes meaning is specific to a structured type
          * Limited to a context within an application

  * Tag Number

type	tag#(hex)	type	tag#(hex)
INTEGER	02	Numeric String	12
BIT STRING	03	PrintableString	13
OCTET STRING	04	T61String	14
NULL	05	Videotex String	15
OBJECT IDENTIFIER	06	IA5String	16
OBJECT DESCRIPTION	07	UTCTime	17
REAL	09	Generalized Time	18
ENUMERATED	0A	Graphic String	19
EMBEDDED-PDV	0B	Visible String	1A
SEQUENCE (& OF)	10	General String	1B
SET (& OF)	11	Universal String	1C