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Additional Features

ASN.1 defines a subtype notation and value sets, a method for handling recursion in data types, and a macro facility. Subtypes and recursion are used more frequently than macros. We include macros because of their role in common service elements of the Application Layer discussed in a later Chapter. Macros in ASN.1 became depreciated in 1994 and were replaced by Information Objects. Information Object provide the functionality of Macros, however they added improved features.

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Computer Networks and Open Systems
An Application Development Perspective

Lillian N. Cassel
Richard H. Austing

Jones & Bartlett Publisher
ISBN 0-7637-1122-5

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Real World ASN.1 and XML Solutions