Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!nuug!ifi!enag From: enag@ifi.uio.no (Erik Naggum) Newsgroups: comp.protocols.iso Subject: Re: ASN.1 Message-ID: Date: 27 Aug 90 23:45:08 GMT References: <2721@vela.acs.oakland.edu> <1990Aug27.160524.23104@indetech.com> Sender: enag@ifi.uio.no (Erik Naggum) Organization: Naggum Software, Oslo, Norway Lines: 28 Nntp-Posting-Host: svarte.ifi.uio.no In-Reply-To: schmidt@indetech.com's message of 27 Aug 90 16:05:24 GMT Originator: enag@svarte.ifi.uio.no In article <1990Aug27.160524.23104@indetech.com> schmidt@indetech.com (Douglas C. Schmidt) writes: Andrew Tanenbaum's Computer Networks book (with the Orange cover, second edition (?)) contains about 10 pages of overview of ASN.1. In there he mentions that an addendum to the original ISO 8824 draft includes explicit support for bounded array declarations. I'm curious whether anyone knows where to find additional information about this addition to the ASN.1 spec? If you order IS 8824 from ISO or your favorite standars outlet (ANSI, perhaps), Addendum 1 will be included. I'm quite sure that they are fully willing to sell you only the addendum. It's usually referred to as ISO 8824A1. The addendum also adds support for macroes and other nice stuff that it became pretty obvious was needed when the standard was applied outside of ISO. CCITT X.208 contains these by default. This makes cross-reference between the two "technically aligned" standards somewhat difficult, but it works. I would suggest ordering the CCITT version rather than the ISO version with addendum. It's in the X.200 fascicle of the Blue Book. ANSI also sells these, I know. The ISO texts (IS 8824/5 + addenda) cost four times more than the CCITT texts, and the CCITT come in a nice blue soft cover, with the entire X.200 series recommendations, as well. You may want to save some money, this way. -- [Erik Naggum] Naggum Software; Gaustadalleen 21; N-0371 OSLO; NORWAY I disclaim, , therefore I post. +47-295-8622, +47-256-7822, (fax) +47-260-4427