Thursday, March 21, 2013
council@muc.xmpp.org
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XMPP Council Room | http://xmpp.org/about-xmpp/xsf/xmpp-council/ | Room logs: http://logs.xmpp.org/council/ | https://trello.com/b/ww7zWMlI/xmpp-council-agenda

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[10:01:22] <Tobias> http://www.dtic.mil/dtic/tr/fulltext/u2/a518679.pdf (printed page 108) a comparison of XML, gzipped XML and EXIed XML...for those interested
[10:04:27] <Kev> Interesting - although I'm not reading far enough to see what their documents are. I suspect that XMPP is at the end of things that gzip very well indeed.
[10:04:50] <Kev> I'd be more interested in comparisons for a bunch of XMPP stanzas.
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[10:05:46] <Tobias> yup
[10:06:49] <Tobias> and EXI probably also does something to reduce CDATA right?
[10:08:17] <Kev> I assume it does something - whether it does anything better than gzip I don't know. I need to look into this stuff.
[10:08:23] <Kev> Dave Cridland: You're the compression expert. Do you know?
[10:16:06] <Dave Cridland> Not that I'm a compression expert, but as far as I know, EXI without schema knowledge is roughly the same as gzip - it's a binary DOM tree representation, gzipped.
[10:16:18] <Dave Cridland> It *is*, however, lighter weight to parse.
[10:16:58] <Dave Cridland> If it's schema-informed, then it can run a lot better (as it essentially uses the schema as an input dictionary, in compression terms).
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[10:27:52] <Dave Cridland> So to summarize - EXI without schema informing isn't interesting in the mainstream, but might now become interesting in the IoT - the processing power in a "device" being now big enough to handle XMPP/EXI. With schema negotiation done right, I think it could prove generally interesting.
[10:28:34] <Kev> Does having a schema make it further easier to parse, or just compress better?
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[10:48:00] <Dave Cridland> I don't know.
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