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Re: How to use CDBase URIs in Content MathML?

From: Urs Holzer <urs@andonyar.com>
Date: Mon, 12 Jul 2010 17:41:05 +0200
To: David Carlisle <davidc@nag.co.uk>
Cc: Christoph LANGE <ch.lange@jacobs-university.de>, "www-math@w3.org" <www-math@w3.org>
Message-Id: <201007121741.05387.urs@andonyar.com>
I wrote as answer to David:
> Isn't this the same as claiming that there is no need for a namespace
> mechanism for XML because elements would have unique names anyway?

Please don't consider this answer as offensive. Perhaps I misformulated 
it a little. The substring "OM" in all the element names from the 
OpenMath XML encoding are there because at some point, it was not 
possible to just use an XML namespace. Let me show the parallels of the 
cdbase and the XML namespaces:

In my opinion, the prefix of an element or attribute in XML is similar to 
the OpenMath cd. The local name in XML is similar to the symbol name in 
OpenMath. Finally, the URI of the namespace is similar to the cdbase in 
It is widely accepted that just chosing prefixes carefully in XML without 
using URIs to identify the namespaces is not enough in practice. I 
believe that the same is true in the case of OpenMath and therefore also 
Content MathML: Chosing the cd carefully is not enough in practice.

Received on Monday, 12 July 2010 15:41:38 UTC

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