[DFDL-WG] DFDL bits - version 5

[Mike Beckerle]

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 at 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 at uk.ibm.com,
> Phone (+44)/(0) 1962-815848
>
>
>  From: Mike Beckerle <mbeckerle.dfdl at gmail.com> To: dfdl-wg at ogf.org Date: 06/01/2010
> 04:53 Subject: [DFDL-WG] DFDL bits - version 4 Sent by:
> dfdl-wg-bounces at 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]
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