[DFDL-WG] Can I prevent data from getting into the infoset?

[Steve Hanson]

The DFDL mechanism is dfdl:hiddenGroupRef. It is fully described in the 
spec section 14.5, with an example. 

There is a bigger example in section 17, which shows how to use 
dfdl:hiddenGroupRef and dfdl:inputValueCalc and dfdl:outputValueCalc to 
'synthesise' items in the infoset from hidden items in the data.

None of these three properties are supported by IBM DFDL as yet.

You can do what you want with the infoset post-parse, that is beyond the 
scope of the DFDL spec. But bear in mind that if an element is minOccurs > 
'0' then the serializer will expect it to be there, and give an error 
unless you supply a default value. You need to be careful what you drop as 
well. Dropping DisplayName might make sense, so your data looks like  
<jgarriss at mitre.org>, but dropping Domain might result in  “James Garriss” 
<jgarriss@>, it depends on what is being treated as delimiters.

Regards

Steve Hanson
Architect, 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:   01/03/2013 12:42
Subject:        [DFDL-WG] Can I prevent data from getting into the 
infoset?
Sent by:        dfdl-wg-bounces at ogf.org



Suppose I have an email address with 3 parts, a display name, a local 
part, and a domain.
 
  “James Garriss” <jgarriss at mitre.org>
 
Display name = James Garriss
Local part = jgarriss
Domain = mitre.org
 
DFDL is capable of parsing and validating these as three elements.  No 
problem.
 
But let’s suppose that I don’t want one of these elements, the display 
name, to make it into the infoset.  I just want to drop it on the floor 
after I parse it.
 
Question #1:  Can I do that?  If so, how?
 
Alternatively, suppose I want it in the infoset, but then I want to 
programmatically remove it from the infoset *before* I unparse it.
 
Question #2:  Is that possible?  If so, how?
 
TIA--
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  dfdl-wg at ogf.org
  https://www.ogf.org/mailman/listinfo/dfdl-wg

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