By Olivier Dubuisson
ASN.1, summary Syntax Notation model 1, is a notation that's utilized in describing messages to be exchanged among speaking program courses. This e-book is a natural programming instructional at the basics and lines of ASN.1. the aim of this booklet is to give an explanation for ASN.1 and its encoding principles in easy-to-understand phrases. It addresses the topic at either an introductory point that's appropriate for newcomers, and at a extra exact point that's intended in case you search a deeper knowing of ASN.1 and the encoding rules.
Follow-up to final years, ASN.1 whole by means of John Larmouth. whereas Larmouth's ebook is a accomplished language reference, this e-book is a pragmatic programming instructional.
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Additional info for ASN.1 Communication between heterogeneous systems
Depends on the machine so that a common representation is required for exchanging the data. The presentation layer provides the data to be transmitted with this structure but is not concerned in the semantics of the information. To make two speakers converse, we need first to share a common knowledge (a dictionary) and second, we have to agree on a language before starting a conversation using preliminaries such as: — Do you speak English? Parlez-vous fran¸cais ? Te parau anei ’oe i te reo Tahiti ?
Otherwise said, one should bear in mind the two levels of grammars [ASU86]: first, the grammar of the ‘ASN’ abstract syntax notation itself; second, the abstract syntax, which is also a grammar9 and is defined using the former. This abstract syntax notation must be formal to prevent all ambiguities when being interpreted and handled by computing tools as described at the end of this chapter. Drawing a parallel with language theory, the abstract syntax notation can be seen as a BNF (or Backus-Naur Form) that allows one to write specific grammars, which are called abstract syntaxes in a data transfer context.
1 is one of the concepts that should live through, particularly because it is more and more used in protocols outside the OSI world (see Chapter 7). However, to ensure that the notation keeps up its position, the standard should get rid of its few ambiguous parts, sometimes awkwardly put, and the new concepts that will be introduced should be easier to manipulate and should prove useful for the specifier. This would prevent the notation from being considered as the private domain of a few, perhaps suspected to be disconnected from reality and ill-at-ease when it comes to follow the technical changes.