XMPP Council - 2013-03-21

  1. 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

  2. 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.

  3. Kev

    I'd be more interested in comparisons for a bunch of XMPP stanzas.

  4. Tobias


  5. Tobias

    and EXI probably also does something to reduce CDATA right?

  6. Kev

    I assume it does something - whether it does anything better than gzip I don't know. I need to look into this stuff.

  7. Kev

    Dave Cridland: You're the compression expert. Do you know?

  8. 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.

  9. Dave Cridland

    It *is*, however, lighter weight to parse.

  10. 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).

  11. 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.

  12. Kev

    Does having a schema make it further easier to parse, or just compress better?

  13. Dave Cridland

    I don't know.