[DFDL-WG] Specify field based on the beggining of the binary file

Mon Sep 17 13:28:40 EDT 2012

It sounds like you need two DFDL schemas and two parse operations.
The first schema models the whole message. It takes the whole data stream 
as input and creates an infoset for Header, Field1, Field2, Field3.
The second schema models just Field 4 using leadingSkip and trailingSkip 
to position correctly. It takes the Header from the first infoset as 
input, and creates an infoset for Field4.

        <xs:element name="Field4" type="xs:hexBinary" 
dfdl:lengthKind="explicit" dfdl:length="3" dfdl:lengthUnits="bytes"
                                      dfdl:leadingSkip="316" 
dfdl:trailingSkip="193" dfdl:alignmentUnits="bytes" />

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:   Miguel Vieira <carlos.vieira at gmv.com>
To:     Steve Hanson/UK/IBM at IBMGB
Cc:     "dfdl-wg at ogf.org" <dfdl-wg at ogf.org>
Date:   17/09/2012 18:04
Subject:        RE: [DFDL-WG] Specify field based on the beggining of the 
binary file

Hi Steve!

I need them both.

From: Steve Hanson [mailto:smh at uk.ibm.com] 
Sent: segunda-feira, 17 de Setembro de 2012 18:00
To: Miguel Vieira
Cc: dfdl-wg at ogf.org
Subject: RE: [DFDL-WG] Specify field based on the beggining of the binary 
file

Is Field4 the only part of the Header that is of interest? 
Do you want the full Header (as a 512 byte BLOB) and Field4 in the 
infoset? 

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:        Miguel Vieira <carlos.vieira at gmv.com> 
To:        Steve Hanson/UK/IBM at IBMGB 
Cc:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org> 
Date:        17/09/2012 16:06 
Subject:        RE: [DFDL-WG] Specify field based on the beggining of the 
binary file 

First of all: Thanks! J 

My binary data specification is: 
Header: 512Bytes; 
Field1: 21504 bytes (21KB); 
Field2: 5Bytes; 
Field3: 1Byte; 
Field4: 3 Bytes  ßStating at byte 316 counting from the beginning of the 
file. 

This means that Field4 is placed inside the Header field. 

“leadingSkipBytes” or  “alignment” would do, but can you specify the place 
you start counting? 

Thanks. 
Miguel 

From: Steve Hanson [mailto:smh at uk.ibm.com] 
Sent: segunda-feira, 17 de Setembro de 2012 15:41
To: Miguel Vieira
Cc: dfdl-wg at ogf.org
Subject: Re: [DFDL-WG] Specify field based on the beggining of the binary 
file 

Miguel, please can you send us a graphic of the data in question, I want 
to make sure I have understood your data correctly. 

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:        Miguel Vieira <carlos.vieira at gmv.com> 
To:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org> 
Date:        17/09/2012 15:03 
Subject:        [DFDL-WG] Specify field based on the beggining of the 
binary file 
Sent by:        dfdl-wg-bounces at ogf.org 

Hi! 

I have a binary file specification that specifies some fields referenced 
by the beginning of the binary info. 
For instance imagine that there is a field with 1024Bytes and the next one 
starts at byte 512 counting from the beginning of the info. 

Is it possible to do that using dfdl? 
I’ve seen dfdl:floating, but I can’t find much info on that. 

Thanks. 

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