Hello Jyoti

Welcome to DFDL

DFDL V1 only directly supports single dimension arrays through the use of the occursxxx properties defined in section 19. A 2D array must be defined as an array of array. The following is a simplified version of the example in section 20 that shows a fixed number of rows and columns.

        <xs:element name="rows"  
                    dfdl:occursCountKind="explicit"
                    dfdl:occursCount="5">
           <xs:complexType>
             <xs:sequence>
               <xs:element name=”cols” type=”xs:float”
                    dfdl:occursCountKind=”explicit”
                    dfdl:occursCount=”10“ />
             </xs:sequence>
          </xs:complexType>
                 </xs:element>    



In DFDL V1 we have primarily concentrated on structured commercial formats so have not thought too much about image files etc althought it is intended that DFDL is capable of defining these types of data.

Alan Powell

MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM     email: alan_powell@uk.ibm.com  
Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898


From: "Jyotishman Pathak" <jyotishman.mayo@gmail.com>
To: dfdl-wg@ogf.org
Date: 23/12/2008 21:38
Subject: [DFDL-WG] DFDL Example for 2D arrays




Hello all,

I am a newbie in DFDL, and trying to grasp some of the key aspects going through the latest core spec: http://forge.gridforum.org/sf/go/doc15397?nav=1

Pardon me if this question is nonsensical, but I wonder if there are any examples of how a DFDL schema/document will look like if Matrix.data is representing a 2D array? Or if there are any sample DFDL documents for an image file (jpg, png etc.). The simple example that you have in pages 19--20 of the core spec is indeed helpful to understand the guts of the idea, but I would like to see somewhat more complex examples.

I look forward to your help.

Thanks,
- Jyoti

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