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RE: error recovery

From: David Lee <David.Lee@marklogic.com>
Date: Sat, 18 Feb 2012 10:08:32 -0800
To: Noah Mendelsohn <nrm@arcanedomain.com>, Norman Walsh <ndw@nwalsh.com>
CC: W3C XML-ER Community Group <public-xml-er@w3.org>
Message-ID: <EB42045A1F00224E93B82E949EC6675E16ADAEE2F6@EXCHG-BE.marklogic.com>
Question: If this *cant* be done in a streaming processor what does that mean ?
Does it mean the input must be fully read in order to "fix" it ?  In what format ?  A degenerate case is pure text with no markup.   Then the non-streamed format is an array of bytes/chars.  Is that any better than a stream of bytes ?  

I agree that trying to enforce streaming into a spec is very difficult and typically over-optimizing considering the definition of streaming is still up for debate.
But let's consider the reverse.  Do we enforce a particular view on the raw data that is NOT a 'stream of characters'  (ignoring encoding for the moment)
 That is, what is the data model of the un-fixed data if not a stream of chars ?  I think that needs to be decided first. 
What is the abstract data model of the input data.  From there, streaming or no, should be irrelevant or unnecessary to spec.

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David Lee
Lead Engineer
MarkLogic Corporation
dlee@marklogic.com
Phone: +1 650-287-2531
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> -----Original Message-----
> From: Noah Mendelsohn [mailto:nrm@arcanedomain.com]
> Sent: Saturday, February 18, 2012 12:37 PM
> To: Norman Walsh
> Cc: W3C XML-ER Community Group
> Subject: Re: error recovery
> 
> 
> On 2/18/2012 7:32 AM, Norman Walsh wrote:
> > I'm coming around to the view expressed by Noah and David (and others)
> > that we'd be better off casting this as a new set of parsing rules for
> > interpreting some sequences of characters that resemble XML but are
> > not well-formed in a way that deterministicly produces a tree.
> 
> > I think when the process finishes, and we have a tree (if we have a
> > tree), it will be possible (for a human) to look back and say, we got
> > this tree by correcting these errors in these ways.
> 
> Yes, I think that's generally where the focus should be. As I said in my
> earlier note, I think it's worth giving a bit of thought to whether it will
> be easy or hard to put reasonably tight bounds on identifying the subtrees
> that correspond to non-wellformed input. I also think we should
> demonstrate
> that the mapping can be implemented efficiently in a streaming processor
> for those who need streaming (though, in certain cases, there may be a
> tradeoff between streamability and the care taken in mapping non-
> wellformed
> input, as doing the latter well might involve backtracking).
> 
> I don't think we should standardize the APIs that expose either the tree or
> error identifications, and I don't think we should the characteristics
> processors themselves.
> 
> Noah
> 

Received on Wednesday, 22 February 2012 12:55:53 GMT

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