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

Paul Prescod wrote:
> Of your six potential requirement I only intended to deal with "1.".
> With respect to 2: I see no reason to ALLOW a type to DISALLOW further
> extension by its sub-types. It feels like extra work to no benefit.

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.

I realize that this is probably a fairly uncommon case, but I suggest it 
for completeness.

> Similarly, for 3: I don't think that DITA really has a notion of
> instance attributes and I don't see a strong argument for it.

There is an at least implicit distinction between DITA-defined 
attributes and all other attributes.

This ability would be analogous to the ability to indicate whether or 
not attributes must be qualified in an XSD schema. For example, to avoid 
confusion you want to require that any non-DITA-defined attributes used 
in your specialized documents be qualified, so as it to make it extra 
clear that these attributes are not DITA-defined.

This is recognition of the fundamental problem of recognition posed by 
the use of the no-namespace namespace--namely, you have no reliable, 
general way to tell what application the attributes correspond to. Thus 
it seems like it might be useful to disallow the confusion by requiring 
non-DITA-defined attributes to be qualified.


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


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