Talk:Abstract Syntax Notation One
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Why the capital letters in the article's title while lower-case is used in the first sentence? Which is correct? (Wikipedia articles conventionally do not capitalize words in article titles unless they would otherwise be capitalized, except that the first letter is case-insensitive and always gets rendered as a capital.) Michael Hardy 20:26, 13 Sep 2004 (UTC)
- I spotted this in the page history, 02:18, 26 January 2006 Mulad m (moved Abstract syntax notation one to Abstract Syntax Notation One: Being a standard, this should be uppercase)--Kelby 23:19, 8 June 2006 (UTC)
Contents |
[edit] ASN.1 versus text encodings
This recently added section is problematic as there are multiple ASN.1 encoding rules which produce textual output, such as GSER. Additionally one doesn't need a compiler to produce encoders/decoders for binary encodings, and one may use a compiler to produce encoders/decovers for textual encodings. I recommend this section be deleted or significantly rewritten. Kdz 20:57, 25 February 2006 (UTC)
- Agreed. GSER is not a good example as it's primarily meant merely for inputting/representing data by/for the user, but XER entirely qualifies as a textual representation of ASN.1. -- intgr 22:01, 25 February 2006 (UTC)
I tried to fix this and be more complete and consise, as I think the text-vs-binary debate in an important point in the real world of protocol design. Perhaps this discussion should be somewhere else, but it is often associated with ASN.1.
[edit] Website advertising in the external links?
There are 6 external links that all lead to pages on http://asn1.elibel.tm.fr/ This number of links make it feel like advertising for the website. I suggest there should be just a single link to the website. --Kelby 23:27, 8 June 2006 (UTC)
- Agreed. I removed all the links except for one that links to the homepage. -- intgr 12:41, 12 June 2006 (UTC)
[edit] A small error in DER encoding example?
Shouldn't the length of the "Anybody there?" string be 14 instead of 13?
-- mjsv
- Note that all values are in hexadecimal, so we have: 1 (length of integer tag) + 1 (length of integer length) + 1 (length of integer value) + 1 (length of string tag) + 1 (length of string length) + 0e (length of string value) = 13. Rasmus (talk) 20:06, 18 June 2006 (UTC)
[edit] DER example -- VisibleString tag wrong?
The example says:
04 -- tag indicating VisibleString 0e -- length in octets
However, in X.680 section 37.1, VisibleString is listed as having universal tag 26 (0x1A). It's true that all strings are B/C/DER encoded like an OCTET STRING (universal tag 4), but it seems the encoded tag should still be 0x1A, see for instance the example of X.690 section 8.21.5.4.
Of course, the involved standards are quite complex and tersely written, so I may be mistaken, which is why I ask here instead of just changing it. -- Kwi | Talk 23:32, 17 July 2006 (UTC)
- The SEQUENCE tag should be 0x30, the VisibleString tag should be 0x1A. Verified with an ASN.1 compiler. So, there were two wrong tags, not one.
- -- Vlm 20 September 2006
[edit] KISS
Or Keep It Simple, Stupid! Example section is meant for people who completely don't understand what ASN.1 is about. And not for people who want to learn how unaligned PER is "better" than XER. I've noticed a trend to overly complicate this section.
So be gentle and don't throw all information at once. Step by step, step by step. Simple language. One new term per paragraph :)
--Kubanczyk 23:02, 18 December 2006 (UTC)
