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RE: Question on movesinstitute AVCL test case schemaless encoding

From: John Schneider <john.schneider@agiledelta.com>
Date: Mon, 13 Oct 2008 09:22:30 -0700
To: "'Ed Day'" <edday2006@gmail.com>, <public-exi@w3.org>
Message-ID: <4A237783A3FA4B0D9FA296048CCEE810@jcsdell8600>

Hi Ed,

Thanks for reporting this. I can help take a look at it to see what's going
on.

	Cheers,

	John 

> -----Original Message-----
> From: public-exi-request@w3.org 
> [mailto:public-exi-request@w3.org] On Behalf Of Ed Day
> Sent: Monday, October 13, 2008 7:20 AM
> To: public-exi@w3.org
> Subject: Question on movesinstitute AVCL test case schemaless encoding
> 
> 
> We have run across an issue with the schemaless encoding of 
> AVCL in the movesinstitute test data.  We believe either the 
> encoding is not correct, or it needs to be explained better 
> in the spec.
> 
> An error occurs in our implementation as well as the two open 
> source implementations (ExiLib and EXIficient) before the 
> second "meta"
> element
> 
>   <head>
>       <meta name="description" content="AVCL output file 
> generated by AUVWorkbench"/>
>       <meta name="description" content="Execution Level Output File"/>
> 
> file telemCompTest1M.xml_NOSCHEMA_BYTEALIGN.exi has the 
> following byte sequence:
> 
> 01 00 - SE(*) - first occurrence of  element "meta" in "head"
> ElementContent grammar.
> 01 00 04 - "meta" qname - uri = "", 4rd record from uri "".
> 02 00 - must be AT(name) - exi2xml expect event code 01, but 
> 02 00 is EE event.
> 01 string - must be AT(content) - exi2xml expect event code 00.
> 
> I.e. exi2xml generates grammar:
> 
> AT(content)    0
> AT(name)       1
> EE                2.0
> ....
> 
> But event sequence expect grammar:
> 
> ?                   0
> AT(content)    1
> AT(name)       2
> EE                3.0
> ....
> 
> The first event may be CH.  But according to the spec, a CH 
> event should only be inserted into the grammar when the 
> element contains content ("meta" has empty content).  This is 
> the relevant paragraph in the spec:
> 
> "All productions in the built-in Element grammar of the form 
> LeftHandSide : CH RightHandSide are evaluated as follows:
> 
>    1. If a production of the form, LeftHandSide : CH 
> RightHandSide with an event code of length 1 does not exist 
> in the current element grammar, create one with event code 0 
> and increment the first part of the event code of each 
> production in the current grammar with the non-terminal 
> LeftHandSide on the left hand side.
>    2. Add the production created in step 1 to the grammar
>    3. Evaluate the remainder of event sequence using RightHandSide."
> 
> Since there is no CH event in the previous sequence for meta, 
> we can't see how this is getting added, or if it is supposed 
> to be something else.
> 
> Regards,
> 
> Ed Day
> Objective Systems, Inc.
> http://www.obj-sys.com
> 
Received on Monday, 13 October 2008 16:23:19 UTC

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