Updated proposal based on comments
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
----- Forwarded by Alan
Powell/UK/IBM on 06/10/2009 18:15 -----
| From:
| Steve Hanson/UK/IBM
|
| To:
| Tim Kimber/UK/IBM@IBMGB
|
| Cc:
| Alan Powell/UK/IBM@IBMGB, Suman Kalia/Toronto/IBM@IBMCA,
Mike Beckerle <mbeckerle.dfdl@gmail.com>, Peter Lambros/UK/IBM@IBMGB,
steve.marting@progeny.net
|
| Date:
| 30/09/2009 10:31
|
| Subject:
| Re: Parsing Rules for resolving points
of uncertainty (speculative parsing) |
Some more comments in here.
Steve copied in as will be discussed
on call today.
[attachment "Resolving Uncertainty
v1.doc" deleted by Alan Powell/UK/IBM]
Regards
Steve Hanson
Programming Model Architect, WebSphere Message Brokers,
OGF DFDL WG Co-Chair,
Hursley, UK,
Internet: smh@uk.ibm.com,
Phone (+44)/(0) 1962-815848
| From:
| Tim Kimber/UK/IBM
|
| To:
| Mike Beckerle <mbeckerle.dfdl@gmail.com>
|
| Cc:
| Alan Powell/UK/IBM@IBMGB, Suman Kalia
<kalia@ca.ibm.com>, Peter Lambros/UK/IBM@IBMGB, Robert Connolly <rconnoll@us.ibm.com>,
Steve Hanson/UK/IBM@IBMGB
|
| Date:
| 28/09/2009 14:20
|
| Subject:
| Re: Parsing Rules for resolving points
of uncertainty (speculative parsing) |
re: Mike's point, I would suggest
- member of a choice group/unordered
group/group containing floating elements: scope of uncertainty is the scope
of the element
- optional occurrence : parser tries
first to parse another occurrence, and the scope of uncertainty is the
scope of the element. Secondly, parser tries to parse the item following
the element ( which may be a group ) and the scope of uncertainty is the
scope of that element/group.
re: Alan's draft, I think the final
para could be replaced with the following two statements:
- if a processing error is encountered
while parsing an option, the parser will back up and try the next option.
If there are no further options, the processing error will propagate out
to the next enclosing point of uncertainty.
- a dfdl:assert can be used to trigger
a processing error. If the expression evaluates to false, the parser will
behave exactly as if a normal processing error had been encountered.
Wording can probably be improved...
regards,
Tim Kimber, Common Transformation Team,
Hursley, UK
Internet: kimbert@uk.ibm.com
Tel. 01962-816742
Internal tel. 246742
| From:
| Mike Beckerle <mbeckerle.dfdl@gmail.com>
|
| To:
| Alan Powell/UK/IBM@IBMGB
|
| Cc:
| Steve Hanson/UK/IBM@IBMGB, Tim Kimber/UK/IBM@IBMGB,
Robert Connolly <rconnoll@us.ibm.com>, Peter Lambros/UK/IBM@IBMGB,
Suman Kalia <kalia@ca.ibm.com>
|
| Date:
| 25/09/2009 21:53
|
| Subject:
| Re: Parsing Rules for resolving points
of uncertainty (speculative parsing) |
Some feedback attached.
We need some notion of the region of uncertainty, so we
can discuss where assertions and discriminators have effect, and so we
can say when the uncertainty ends and we no longer consider backtracking
that region just because we finished without processing error.
On Fri, Sep 25, 2009 at 11:51 AM, Alan Powell <alan_powell@uk.ibm.com>
wrote:
Guys (limited distribution initially)
I have simplified the previous speculative parsing description into a set
of simple rules.
Discussion points
1. Deemed
to be found rule 1 'All the components of the option are found' could severely
limit the ability to do partial parsing as it includes everything up to
the terminator.
2. Do
all/more the processing errors need to be listed for Not Found rule 3?
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
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
[attachment "Resolving Uncertainty
v1.doc" deleted by Tim Kimber/UK/IBM]
[attachment "Resolving Uncertainty
v1.doc" deleted by Steve Hanson/UK/IBM]
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