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Subject: Re: [dita] DITA Proposed Feature: Extensibility of DITA through new attributes

Paul Prescod wrote:
>>Within an enterprise you may want to disallow further 
>>specialization of a set of types. That is, one key benefit of 
>>specialization is that it can be *controlled*. Thus it 
>>follows that you should have the option of disallowing it, 
>>as well as allowing it.
> Would you buy the argument that a type should be able to control the
> addition of other attributes if and only if the type can control other
> aspects of specialization? E.g. if a type can declare that it is or is
> not specializable or allows for content model tightening? Do you agree
> that controlling attribute specialization is just a small part of it? If
> so, then I would defer it until the whole issue of specialization
> control is covered holistically.

Seems reasonable to me.

> We could make that rule globally. Or we could give specializers control
> over it as part of the specialization control issue. I would say that
> attributes belong to the same namespace/domain as the elements they are
> on unless they use a namespace prefix explicitly.

Hmm, I thought that the Namespace spec didn't justify this behavior but 
I guess it does. This is from 6.2 Namespace Defaulting, in the XML Names 
1.1 spec:

"Default namespace declarations do not apply directly to attribute 
names; *the interpretation of unprefixed attributes is determined by the 
  element on which they appear.*" [Emphasis mine]

So I think it would be reasonable for DITA to define the processing 
implications of unqualified attributes.

I would also prefer a rule that encourages the qualifying of 
application-specific attributes.



W. Eliot Kimber
Professional Services
Innodata Isogen
9390 Research Blvd, #410
Austin, TX 78759
(512) 372-8155


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