I made the title corrections below, and cleaned up the "pseudo code" a little, changing fieldWidth to bitStringLength. This is the best I can do for the v1.0 draft. On Wed, Jan 6, 2010 at 5:47 AM, Steve Hanson <smh@uk.ibm.com> wrote:
Mike
Minor comments before today's call:
I'm happy for 1.0 to restrict the use of lengthUnits='bits' to a specific set of logical types as per your doc.
Section *Bits within Bit Strings of Length < 8* should really be *Bits within Bit Strings of Length <= 8*
Section *Numeric Value of a Bit String* is better titled *Bits within Bit Strings of Length > 8 *for symmetry
Regards
Steve Hanson Programming Model Architect, WebSphere Message Brokers, OGF DFDL WG Co-Chair, Hursley, UK, Internet: smh@uk.ibm.com, Phone (+44)/(0) 1962-815848
From: Mike Beckerle <mbeckerle.dfdl@gmail.com> To: dfdl-wg@ogf.org Date: 06/01/2010 04:53 Subject: [DFDL-WG] DFDL bits - version 4 Sent by: dfdl-wg-bounces@ogf.org ------------------------------
I've fixed the issues identified by Suman and Alan.
RE:
1. On the last WG call Steve H suggested allowing lengthUnit='bits' for any logical type as long as the length was a multiple of 8. Did you decide against that?
I did not decide on this either way. Which ever requires the least writing in the spec is fine with me.
Consider: dfdl:lengthUnits="bits" for dfdl:representation="text". This is exactly equivalent to dfdl:lengthUnits="bytes" with the length, however it is determined (prefix, or explicit) to be divided by 8. Now, what if the length comes back from the expression or prefix as not a multiple of 8. Then we have to detect a processing error..... length in bits not a multiple of 8, and we have to explain why this is an error, etc.
Unless there is a use case that requires this, I'd rather not put it in just for uniformity's sake. I'd rather say that lengthKind="bits" is available only for a specific narrow set of types.
[attachment "DFDL Bits-bigEndian-bias.doc" deleted by Steve Hanson/UK/IBM] -- dfdl-wg mailing list dfdl-wg@ogf.org http://www.ogf.org/mailman/listinfo/dfdl-wg
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