Hang on.  Is dfdl:hiddenGroupRef the answer to my question below?

From: Garriss Jr., James P.
Sent: Friday, March 01, 2013 7:43 AM
To: dfdl-wg@ogf.org
Subject: Can I prevent data from getting into the infoset?

Suppose I have an email address with 3 parts, a display name, a local part, and a domain.

  “James Garriss” <jgarriss@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