[standards-jig] JNG - binary headers.

Adam Theo theo at theoretic.com
Wed Aug 14 19:39:32 UTC 2002


Yes, as I'd said earlier in reply to Iain's idea, I think some sort of 
"magic digit" (was that the term?) would be the best method. Something 
that allowed for backwards compatability with pure XML framing, but also 
allow for SIP, BEEP, Mike Lin's binary framing, and others that may come 
up in the future.

Thanks, Timothy for taking the time to really outline and explain how 
other technologies have done the same.

Timothy Carpenter wrote:
> I too have been lurking, but want to voice my USD0.02
> 
> Binary headers need not be fixed or impossible to evolve 'elegantly'.
> 
> Headers can be extensible using bits, or even bytes to flag an extension
> much as UTF-8, RCSU and UNICODE work together and at different levels to
> allow compact bytestreams for ASCII whilst allowing for the full character
> sets and text-friendliness with manageable overheads and consistent encoding
> after unstuffing.
> 
> Trailing binary sentinels (i.e. a post-message stamp to flag EoFrame) are
> bound to occur randomly in the data stream and would cause the computer
> equivalent of dysentry. I also do not think it sensible for each reader
> process to have to scan and compare every byte to detect the end of what
> they are getting before having to process it.
> 
> Thus I support the proposition for dual standards so that link level
> protocols can be selected (e.g. binary headers on or off) via negotiation or
> alternate ports.
> 
> <inspiration>
> They managed to encode colour PAL TV into the existing B/W signal back in
> 1965 so old B/W and new Colour TVs could use the same transmission (and it
> is better than Never Twice the Same Colour). They have since encoded extra
> lines into the 'black bars' around widescreen movies to allow both 4:3 sets
> and 16:9 sets to continue to tune to the same signal and for the 16:9 TVs to
> display full 625 lines (605 nominal) resolution while old, unaware 4:3 TVs
> just show those lines as the black bars in the 'letterbox' format. it is
> called PALplus, I believe.
> </inspiration>
> 
> Everything is possible if we are smart enough.
> Tim
> 
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