[DFDL-WG] text alignment and Errata 2.95 in DFDL Errata v011

[Mike Beckerle]

Steve,

Please add this point to the agenda for next week. We have to revisit this
errata given the 7-bit character encoding. (And, I've discovered now there
are legacy 6-bit as well which do come up.)

...mikeb

On Mon, Nov 26, 2012 at 10:32 PM, Mike Beckerle <mbeckerle.dfdl at gmail.com>wrote:

> We also need to decide on Errata 2.95 which is about whether text is
> implicitly 8-bit aligned.
>
> Given that we have cases of text aligned in other ways (the 7-bit packed
> ascii stuff), this rule seems heavy handed and inflexible.
>
> We could say that if alignment="implicit", then the first codepoint of any
> text is implicitly aligned on an 8-bit boundary. This would apply to
> delimiters, but also to any text that is being scanned with a regex.
> Subsequent codepoints of the same text are not specifically aligned. This
> lets us choose alignment="1", and the 7-bit packed stuff can then have
> syntax in it, have regex's that it must match, etc. but if
> alignment="implicit", then the normal, less error prone behavior of
> skipping to a byte-boundary would be in force.
>
> ...mikeb
>
> On Mon, Nov 26, 2012 at 10:10 PM, Mike Beckerle <mbeckerle.dfdl at gmail.com>wrote:
>
>> I reviewed this.
>>
>> 2.108 has Change: Format annotations.... and also Remove: Format
>> Annotations. Should just have Change.
>>
>> 3.13 I think we missed a couple places where the previous design where we
>> had replacement control is still leaking into the text.
>>
>> Phrase "Any character that is skipped counts as 0." should be dropped. We
>> don't skip anymore.
>>
>> Concerning:  "In the following, the match is against data where any
>> character replacement has already taken place." The first sub-bullet about
>> lengthKind pattern is incorrect. For lengthKind pattern I believe any
>> decode error should cause the match to end, i.e., a pattern that matches
>> digits only will match a string of digts followed by binary data that
>> causes a decode error. Similarly, when matching literal nils, (character or
>> literal value), any decode error should cause the match to fail.
>>
>>
>>
>>
>> On Fri, Nov 23, 2012 at 12:41 PM, Steve Hanson <smh at uk.ibm.com> wrote:
>>
>>> A few corrections made and added errata from Nov 20th call.  Please
>>> review for next call.  Also now on Redmine.
>>>
>>>
>>>
>>> Regards
>>>
>>> Steve Hanson
>>> Architect, Data Format Description Language (DFDL)
>>> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
>>> IBM SWG, Hursley, UK*
>>> **smh at uk.ibm.com* <smh at uk.ibm.com>
>>> tel:+44-1962-815848
>>> ----- Forwarded by Steve Hanson/UK/IBM on 23/11/2012 17:40 -----
>>>
>>> From:        Steve Hanson/UK/IBM
>>> To:        dfdl-wg at ogf.org,
>>> Date:        20/11/2012 14:23
>>> Subject:        First draft of DFDL Errata v011
>>> ------------------------------
>>>
>>>
>>> Please find attached the first draft of Errata v011.
>>> This incorporates all DFDL spec errata raised since v010 (June 22 2012)
>>> until the last DFDL WG call (November 13 2012).
>>> Change tracking: I accepted all changes from v010 so the changes you see
>>> are all due to v011.
>>> I would appreciate a review for correctness and omissions.
>>> Please note that some of the new errata have been best handled by
>>> updating existing related errata, so please read from start.
>>>
>>>
>>>
>>> Regards
>>>
>>> Steve Hanson
>>> Architect, Data Format Description Language (DFDL)
>>> Co-Chair, *OGF DFDL Working Group* <http://www.ogf.org/dfdl/>
>>> IBM SWG, Hursley, UK*
>>> **smh at uk.ibm.com* <smh at uk.ibm.com>
>>> tel:+44-1962-815848
>>> Unless stated otherwise above:
>>> IBM United Kingdom Limited - Registered in England and Wales with number
>>> 741598.
>>> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
>>> 3AU
>>>
>>> Unless stated otherwise above:
>>> IBM United Kingdom Limited - Registered in England and Wales with number
>>> 741598.
>>> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
>>> 3AU
>>>
>>> --
>>>   dfdl-wg mailing list
>>>   dfdl-wg at ogf.org
>>>   https://www.ogf.org/mailman/listinfo/dfdl-wg
>>>
>>
>>
>>
>> --
>> Mike Beckerle | OGF DFDL WG Co-Chair
>> Tel:  781-330-0412
>>
>>
>
>
> --
> Mike Beckerle | OGF DFDL WG Co-Chair
> Tel:  781-330-0412
>
>


-- 
Mike Beckerle | OGF DFDL WG Co-Chair | Tresys Technologies
Tel:  781-330-0412
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