XMPP
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Extensible Messaging and Presence Protocol (XMPP) is an open messaging standard, perhaps best known in its use for cross-platform instant-messaging application interoperability.
The core part of XMPP is now an IETF RFC: RFC-6120.
Up until recently the XMPP world and the Web world rarely crossed, but now thanks to work on stanza.io and XMPP-FTW you can now "talk" XMPP directly from the web.
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PubSub
XMPP has a PubSub protocol for social-networking, as defined in XEP 0060.
The two most advanced social-networking applications built on XMPP are Movim and Salut à Toi. Both provide a gateway to expose the content on the web, with public access for public content.
URIs
All content throughout the XMPP network has a unique URI. Here's a list of common URI representation of resources:
- user: xmpp:user@host
- PubSub node: xmpp:pubsub.host?;node=nodeName
- PubSub publication: xmpp:pubsub.host?;node=nodeName;item=ae890ac52d0df67ed7cfdf51b644e901
Issues
General issues:
- massive spec
- no one has ever fully implemented it
- there's no comprehensive (or even feature covering) test suite
- everyone who tries to implement it, only ever implements a subset of it
- interop requires testing with every implementation you want to interoperate with (instead of just with a standard test suite)
