[DFDL-WG] clarification needed: Ignore case

[Tim Kimber]

I agree with your thoughts on this. We have taken care not to change the 
rules of XSD validation when specifying DFDL. So the ignoreCase property 
controls how we parse the data format, not the logical values in the DFDL 
info set.
I do agree, though, that it is worth making that clear.

regards,

Tim Kimber, DFDL Team,
Hursley, UK
Internet:  kimbert at uk.ibm.com
Tel. 01962-816742 
Internal tel. 37246742




From:   Mike Beckerle <mbeckerle.dfdl at gmail.com>
To:     dfdl-wg at ogf.org, 
Date:   19/06/2013 19:42
Subject:        [DFDL-WG] clarification needed: Ignore case
Sent by:        dfdl-wg-bounces at ogf.org



The ignoreCase property description says this:

Whether mixed case data is accepted when matching delimiters and data
values on input.

This affects the behavior of matching for these properties: initiator,
terminator, separator, nilValue, textStandardExponentRep,
textStandardInfinityRep, textStandardNaNRep, textStandardZeroRep,
textBooleanTrue, textBooleanFalse,

Ignoring that dangling comma at the end, the question is about what this 
leaves out, and making sure this is intentional.

1.      If an element of type string has the XSD attribute fixed="...." 
with some value, is that comparison of the fixed value to the data content 
guided by dfdl:ignoreCase?
2.      If an element of simple type string has enumerations, are the 
comparisons of the enum values to what is found in the data guided by 
dfdl:ignoreCase?
My thought is No and No, as these are purely XSD issues, not DFDL related, 
so we want our behavior to be exactly the same as XSD here. The XSD/XML 
world is simply a very case-sensitive one.

This page (http://www.ibm.com/developerworks/library/x-case/)  is about a 
user asking how to do case-insensitive enum comparisons in XSD. The hack 
workaround is changing to use a pattern/regex match. I.e., instead of case 
insensitive "red" you get a pattern match of "[r|R][e|E][d|D]" which is 
blechy, but effective. 




-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com
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