QinPeng at [EMAIL PROTECTED] wrote on 21/01/2002 04:50: > Hi,all! > Where can I find the BNF description of ASN.1? > the BNF description of X.680 is not a gathered one. >
The answer to this question depends on exactly what YOU mean by "bnf". Unlike ASN.1, there is no single bnf standard (as far as I am aware). The notation used for specifying the collection of sequences of items which form valid instances of the ASN.1 notation is defined in X.680 clause 5. Whether this is "bnf" is a matter of opinion, but it should be possible to extract the text of the production rules from the X.680 series and systematically process these into other forms. It is under discussion within ITU-T SG17 whether to define a standard for syntax production rules (possibly in a form that can be directly processed by a parser generator) to be used within SG17 standards, so that there is at least some consistency within (part) of ITU-T. However, even if it is agreed to proceed with such a standard, it would be a separate decision for each existing notation whether to change the production rules in the Recommendation(s) for the notation to this form. -- Rick Reed - [EMAIL PROTECTED] Tel:+44 1455 55 96 55 Fax:+44 1455 55 96 58 Mob.:+44 7970 50 96 50
