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<xs:element name="Received_Header" dfdl:initiator="Received:%WSP*;" dfdl:terminator="%CR;%LF">
  <xs:complexType>
    <xs:sequence dfdl:separator="%CR;%LF;%SP;" dfdl:separatorPosition="infix">
        <xs:element name="data" type="xs:string" maxOccurs="unbounded" dfdl:lengthKind="delimited" />
    </xs:sequence>
  </xs:complexType>
</xs:element>

DFDL consumes the initiator then starts processing the content of the header as an array of records. The CR+LF+SP are consumed as the separator, because that is the longest match. The CR+LF (no SP) is consumed as the terminator of the header. Clearly that only works if there is no SP straight after the CR+LF for the first line of a header. So you don't need a discriminator.

You will have to stitch the data together post-parse. I guess you could make the sequence hidden and get DFDL to stitch together the data lines into one long string via an element with dfdl:inputValueCalc.  

Ah - I think I see where Mike's earlier append to the mailing list was coming from ?

Regards

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



From:        "Garriss Jr., James P." <jgarriss@mitre.org>
To:        "dfdl-wg@ogf.org" <dfdl-wg@ogf.org>,
Date:        05/06/2013 16:25
Subject:        Re: [DFDL-WG] Ignore extraneous CRLF w/ space?
Sent by:        dfdl-wg-bounces@ogf.org



> Is the problem that the dfdl:terminator '%CR;%LF;' for the end of the header record is firing prematurely when it encounters the CRLF in the data?
 
Exactly.
 
> I would model the data as unbounded repeating records, and use a discriminator to distinguish the repeats from the next header.
 
Uh, could you repeat that in English?  Maybe with a small example?  I freely admit that I don’t understand what you just said.  Thanks!
 
From: Steve Hanson [mailto:smh@uk.ibm.com]
Sent: Wednesday, June 05, 2013 5:21 AM
To: Garriss Jr., James P.
Cc: dfdl-wg@ogf.org; dfdl-wg-bounces@ogf.org
Subject: Re: [DFDL-WG] Ignore extraneous CRLF w/ space?
 
James

Is the problem that the dfdl:terminator '%CR;%LF;' for the end of the header record is firing prematurely when it encounters the CRLF in the data?

If so then I'm not sure that DFDL can ignore the extra %CR;%LF; without using an escape scheme - but there isn't an escape scheme to use.

I would model the data as unbounded repeating records, and use a discriminator to distinguish the repeats from the next header.

Regards

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



From:        "Garriss Jr., James P." <jgarriss@mitre.org>
To:        "dfdl-wg@ogf.org" <dfdl-wg@ogf.org>,
Date:        04/06/2013 19:56
Subject:        [DFDL-WG] Ignore extraneous CRLF w/ space?
Sent by:        dfdl-wg-bounces@ogf.org




Long IMF headers, such as Received, can be wrapped onto the next line by using a CRLF and then a space.  This example has 3 such wrappings:
 
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How do I get DFDL to ignore these wrappings?  For most of the header, it’s not an issue, because I can use a lengthPattern to lookahead to the ; before the date starts.  But once the date starts, I have no way of knowing when it ends, so I need to ignore any CRLF with a space.
 
TIA
 
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