[DFDL-WG] case insensitivity

[Steve Hanson]

DFDL 1.0 has dfdl:ignoreCase 'yes' for use when parsing delimiters and 
other cases where the DFDL parser is trying to match against a 
user-specified string, but there is no property for changing the case of 
data when it is inserted into the infoset. That sort of thing is typically 
considered a post parse transformation step.

However you can achieve the same effect by using an additional dummy 
element that uses dfdl:inputValueCalc.

<xs:sequence>
  <xs:element name="ContentTypeRaw" type="xs:string" 
dfdl:lengthKind="delimited" ... />
  <xs:element name="ContentType" type="xs:string" 
dfdl:inputValueCalc="{fn:lower-case(../ContentTypeRaw}" ... />
</xs:sequence> 

And if you only want the normalized element to appear in the infoset...

<xs:sequence>
  <xs:sequence dfdl:hiddenGroupRef="ContentTypeRaw" ... />
  <xs:element name="ContentType" type="xs:string" 
dfdl:inputValueCalc="{fn:lower-case(../ContentTypeRaw}" ... />
</xs:sequence> 

<xs:group name="ContentTypeRaw">
<xs:sequence>
  <xs:element name="ContentTypeRaw" type="xs:string" 
dfdl:lengthKind="delimited" ... />
</xs:sequence>
</xs:group> 


Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   "Garriss Jr., James P." <jgarriss at mitre.org>
To:     "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>, 
Date:   01/04/2013 14:42
Subject:        [DFDL-WG] case insensitivity
Sent by:        dfdl-wg-bounces at ogf.org



In IMF, headers are generally case insensitive.  Thus these are 
equivalent:
 
Content-Type:  text/html
Content-Type:  TEXT/HTML
Content-Type:  Text/Html
Content-Type:  tExT/hTmL
 
Does DFDL have a way to tell the parser to parse text in a 
case-insensitive manner?  A quick search of the spec didn’t reveal 
anything.--
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