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Re: Blueberry is not "closed" (was: Closing Blueberry)

• From: Elliotte Rusty Harold <elharo@m...>
• To: Ann Navarro <ann@w...>, xml-dev@l...
• Date: Mon, 23 Jul 2001 16:02:20 -0400

At 3:46 PM -0400 7/23/01, Ann Navarro wrote:
>At 03:09 PM 7/23/2001 -0400, Elliotte Rusty Harold wrote:
>>At 2:24 PM -0400 7/23/01, Ann Navarro wrote:
>>
>> >Correct. But are you not arguing that a member of the subset not be able to claim membership in the superset unless it uses a feature outside the intersection?
>> >
>>
>>Yes, that's precisely what I'm arguing. I think that's the most compatible, least painful approach.
>
>How to you propose to prohibit it in a validating fashion?
>

It's trivial. The parser has a boolean flag that says whether or not a Blueberry character has been seen which is initialized to false when the parser starts reading a document. If the parser get to the end of the document, and that flag is still false, it reports a well-formedness error, in whatever way well-formedness errors are normally reported by the parser. 
-- 

+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@m... | Writer/Programmer |
+-----------------------+------------------------+-------------------+ 
|          The XML Bible, 2nd Edition (Hungry Minds, 2001)           |
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