[DFDL-WG] DFDL property precedence - parsing - v1

[Alan Powell]

Steve

I interpret precedence to mean: the order the dfdl properties should be 
inspected and the order of dependency (ie prop y is only relevant if prop 
x is set) so 

As not all properties are relevant to choice, sequence etc shouldn't they 
be in the tree?
Aren't all occursxxx properties dependent on max/minoccurs > 1?
InitiatorSeparator dependent on initiator
Separator dependent on Delimited?

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 
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Steve Hanson/UK/IBM 
11/01/2008 15:02

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Subject
DFDL property precedence - parsing - v1





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Parsing:
[attachment "DFDL Property Precedence (parsing) 001.mm" deleted by Alan 
Powell/UK/IBM] 

Writing:
tbd

Notes:
- Precedence is from top to bottom recursively, so the top priority is 
dfdl:inputValueCalc, then dfdl:byteOrder, then dfdl:encoding, then it's 
children top to bottom, then dfdl:occursKind (you get the idea). 

Questions arising:
- Does dfdl:escapeScheme apply when dfdl:lengthKind = endOfData ?
- Confirm that only signed logical number can have a signed rep, and only 
unsigned logical number can have an unsigned rep ? (change from spec 028 
to 030)
- Should dfdl:terminator, dfdl:separator and dfdl:occursSeparator be lists 
(to handle alternative delimiters) ?  (viz dfdl:nullValues)
- Why isn't dfdl:nullIndicatorIndex encompassed by dfdl:nullIndicatorPath 
?
- Use of enum 'xpath' for dfdl:nullKind.?  We've used "explicit" elsewhere 
and decorated syntax to indicate xpath for other properties. For nullKind 
maybe a better enum would be "external" or "remote" ?
- The advanced text delimiter supplement needs revision - most of its 
content appears to be in the core. Main question is on prefix v infix v 
postfix separators and how that capability is to be specified.


Regards, Steve

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






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