[DFDL-WG] DFDL: Calculated Values section rewrite

[Steve Hanson]

Comments from Ian and Steve:

1) Is it a schema error if default/fixed attributes specified along with 
dfdl:inputValueCalc and/or dfdl:outputValueCalc?

2) 2D array.
- dfdl:occurrences() is not in the expression language in draft 031. Is 
something missing from the language, or should the XPath count() function 
be used here?
- $dfdl:occurrences - $ not needed
- dfdl:outputValueCalc for 'ncols' - we think the else clause should be 
'..\rows[1]\cols'

3) PD date
- As an example, it's perhaps not a good one as we have 
decimalCalendarFormat as a property of a decimal number, which is intended 
to do exactly this
- As it stands, it will need updating to reflect latest decimal supplement

Regards, Steve

Steve Hanson
Programming Model Architect
WebSphere Message Brokers
Hursley, UK
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848



"Mike Beckerle" <mbeckerle.dfdl at gmail.com> 
Sent by: dfdl-wg-bounces at ogf.org
09/04/2008 02:44
Please respond to
mbeckerle.dfdl at gmail.com


To
Alan Powell/UK/IBM at IBMGB
cc
dfdl-wg at ogf.org, dfdl-wg-bounces at ogf.org
Subject
Re: [DFDL-WG] DFDL: Calculated Values section rewrite






 
I?ve attached a revised calculated value properties doc which incorporates 
suggestions from Alan, specifically, there?s a new example, which is a 2-d 
array with nrows, ncols fields stored before it. I think this motivates 
the connection between outputValueCalc, and number of occurrences and 
occurs calculations nicely.
 
?mikeb
 

From: Alan Powell [mailto:alan_powell at uk.ibm.com] 
Sent: Thursday, March 27, 2008 2:02 PM
To: mbeckerle.dfdl at gmail.com
Cc: dfdl-wg at ogf.org; dfdl-wg-bounces at ogf.org
Subject: Re: [DFDL-WG] DFDL: Calculated Values section rewrite
 

Mike 

A couple of comments on the using derived/representation nomenclature with 
OutputValueCalc and a couple of minor corrections. 

However I thought the Length Prefix example a bit odd as I would have 
expected a single HexBinary element rather than an array of bytes. 


Alan Powell

MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com 
Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898



From: 
"Mike Beckerle" <mbeckerle.dfdl at gmail.com> 
To: 
<dfdl-wg at ogf.org> 
Date: 
26/03/2008 16:39 
Subject: 
[DFDL-WG] DFDL: Calculated Values section rewrite
 




My deliverable for the next draft (32) was to revise the calculated values 
section. 
  
I have rewritten it and the draft is attached. 
  
Of note: I have removed the troublesome ?outputLengthCalc? property, as I 
no longer see a critical need for it. One of the examples computes the 
number of occurrences for a byte array, and I think that mechanism along 
with alignment is sufficient to handle the troublesome cases I was 
considering where size of padding had to be dynamically computed. 
  
The section now consists of a short table of definition, followed by 
illustrative examples, however, I think this is fine. The semantics of 
inputValueCalc and outputValueCalc aren?t really that complex. They can be 
described in a paragraph. It is the motivation for them that is 
complicated, so I think examples in the spec, while sometimes considered 
problematic, are OK in this case. 
  
  
  
 [attachment "calculated-value-properties.doc" deleted by Alan 
Powell/UK/IBM] --
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