[DFDL-WG] DFDL bits - version 4

[Mike Beckerle]

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.
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