On Tuesday 06 September 2005 15:31, Mike Beckerle wrote:
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.
A tricky case: bitfield across byte boundary. byte 0 byte 1 bit 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 |a a a| b b b b|c c c c c| d | 0 0 0