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DC-ACCESSIBILITY  February 2007

DC-ACCESSIBILITY February 2007

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Subject:

Re: Not accessible or not adaptable.

From:

Charles McCathieNevile <[log in to unmask]>

Reply-To:

DCMI Accessibility Community <[log in to unmask]>

Date:

Thu, 8 Feb 2007 11:50:45 +0530

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (58 lines)

On Thu, 08 Feb 2007 01:54:25 +0530, Liddy Nevile  
<[log in to unmask]>
wrote:

> Emmanuelle
> have you been able to read the metadata terms we are working on - they 
> reflect the specs in WCAG but in a metadata way and give much more 
> flexibility ... there is a fairly comprehensive set and they are aboutto  
> become an ISO standard at least for education....
>
> The DC conformsTo etc simply did not give us enough useful information 
> about the resource..so we have added a few qualifiers and one new term

But the big question is whether you can state that something is not  
accessible (which
is different from not stating that it is) - the use case is for examples  
that
are showing how not to do things.

There is an issue if we use monotonic logic (which underpins the semantic  
web, a
lot of the assumptions behind Dublin Core, and so on). Broadly speaking, a
statement is expected to be true. If something is going to change state,  
that is
problematic, but there are ways around it.

The reason for EARL's complexity is to provide a reasonable way of  
managing both
trust, and changes in actual status fo the thing under discussion. If,  
instead
of saying "foo is accessible" you say "fred says foo is accessible" then  
you don't
make RDF and other monotonic systems crash if you add a statement "jo says  
foo
is not accessible". (RDF doesn't actually ahve a "not" but you can use OWL  
to
explain that passing "isAnInaccessibleExample" cannot happen to anything  
that
meets WCAG-A, for example. You can then define "isAnInaccessibleExample"  
as test
for EARL and make statements about it.

As I understand it, you could then use that approach for DC metadata.

So, as far as I know, there is no direct way of saying something is  
inaccessible,
but it is easy enough to define a slightly indirect one.

If anyone has a better approach I would love to hear it...

cheers

Chaals

-- 
Charles McCathieNevile Fundacion Sidar
[log in to unmask] +61 409 134 136 http://www.sidar.org

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