Bit fields - (was Re: split into multiple topics - Re: [dfdl-wg] Issues: additional data types)

[Mike Beckerle]

Bit fields issue.

I have been expecting bit fields to work like this:

<element name="threeBitField" type="xs:int" dfdl:length="3" 
dfdl:lengthUnitKind="bits"/>

That is, bit fields are representational, but not part of the type system. 


Is this idea sufficient?

Alternatively we could add a dfdl:bit type, which is a subtype of xs:byte 
having values only 0 and 1. Then you could do things like this:

<element name="myBits" type="dfdl:bit" maxOccurs="3" minOccurs="3" 
dfdl:alignment="0"/>

I put the alignment tag on to emphasize that there's no padding between 
the bits. 




Mike Beckerle/Worcester/IBM at IBMUS 
Sent by: owner-dfdl-wg at ggf.org
09/02/2005 04:34 PM

To
"Robert E. McGrath" <mcgrath at ncsa.uiuc.edu>
cc
dfdl-wg at gridforum.org, owner-dfdl-wg at ggf.org
Subject
split into multiple topics - Re: [dfdl-wg] Issues: additional data types







I'd like to split this topic into several distinct ones: 

Arrays - I have a placeholder for this in the doc. 

Opaque and "code" types are separate. This is related also to the concept 
of "open content". 

Enums 

Bitfields 

Pointers 


Mike Beckerle
Architect, Scalable Computing
IBM Software Group
Information Integration Solutions
Westborough, MA 


"Robert E. McGrath" <mcgrath at ncsa.uiuc.edu> 
Sent by: owner-dfdl-wg at ggf.org 
09/02/2005 03:13 PM 


To
dfdl-wg at gridforum.org 
cc

Subject
[dfdl-wg] Issues: additional data types








Greetings,

Here is an "issue" for the DFDL: additional data types that should
be considered.

Please see attached.

---
Robert E. McGrath
National Center for Supercomputing Applications
University of Illinois, Urbana-Champaign
Champaign, Illinois 61820
(217)-333-6549

mcgrath at ncsa.uiuc.edu 
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