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From: jhh@ihlpl.UUCP (Haller)
Newsgroups: net.lan
Subject: Re: ASN.1, ANSI/ISO dIs 8824, CCITT X.409
Message-ID: <772@ihlpl.UUCP>
Date: Tue, 1-Apr-86 10:54:22 EST
Article-I.D.: ihlpl.772
Posted: Tue Apr  1 10:54:22 1986
Date-Received: Sat, 5-Apr-86 01:32:03 EST
References: <220@nbs-amrf.UUCP>
Distribution: net
Organization: AT&T Bell Laboratories
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> ASN.1 ("Abstract Syntax Notation") is the common name of ISO dIS 8824,
> also a dpANS, and formerly promulgated as CCITT recommendation X.409.
> 
> I am looking for an implementation of the above draft standard.
> Has anyone done one?  It doesn't have to be complete.
> 
> I realize that this is not entirely appropriate to this group, but
> I couldn't think of a better group.  If I get no answers, I will
> repost to net.general.
> 
> Don Libes         {seismo,umcp-cs}!nbs-amrf!libes

After playing with a yacc grammar for X.409 for a while,  I've
given up for the moment.  It is not a LR(1) grammar, causing
yacc not to be usable.  The problems are primarily with the value
definitions.  In particular, it is difficult to tell the difference
between an IdentifierList and a NamedValueList.  There is some discussion
in net.lang.c++ about an object I/O system.  It would be nice to
see it combined with X.409.  C++ seems to be an ideal implementation
vehicle for X.409.

John Haller
AT&T Bell Laboratories
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