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Re: Confusing Example in XML encryption spec

From: Joseph Reagle <reagle@w3.org>
Date: Wed, 30 Jan 2002 11:13:58 -0500
Message-Id: <200201301614.LAA07176@tux.w3.org>
To: Elliotte Rusty Harold <elharo@metalab.unc.edu>
Cc: dee3@torque.pothole.com, xml-encryption@w3.org
On Tuesday 29 January 2002 18:51, Elliotte Rusty Harold wrote:
> Seection 2 of the syntax spec includes the following example:
> <EncryptedData Id? Type?>

Elliot, this is what I call "Eastlake BNF" <smile/>. The intent is to 
succinctly express the overall structure and optionality of the 
EncryptedData instance. We used this in xmldsig (and has appeared in other 
specs now...) where it also had a brief description.

> More substantively, I think this whole example is confusing. It is
> not obvious what the question marks stand for (0 or 1 as in DTDs?)
> Some elements are missing their end tags. 

The editors' draft [1] now has the typo corrected and the description. I 
originally approached this syntax with the same hesitation but folks seem 
to like it and we've received few complaints, so hopefully with the 
addition of the key it will be more useful.

[1]  http://www.w3.org/Encryption/2001/Drafts/xmlenc-core/
$Revision: 1.122 $ on $Date: 2002/01/30 16:12:00 $ GMT by $Author: reagle $


Joseph Reagle Jr.                 http://www.w3.org/People/Reagle/
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/Signature/
W3C XML Encryption Chair          http://www.w3.org/Encryption/2001/
Received on Wednesday, 30 January 2002 11:14:09 UTC

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