OExchange, a new protocol spearheaded by Clearspring, aims to address this problem by specifying a conventional way for publishers to "offer" links to sharing services, and for sharing services to design their API endpoints.
OExchange also provides a mechanism for publishers to discover information about new services that they’ve never seen before using a format called XRD on top of an emerging protocol called host-meta, which happens to benefit from XAuth as well.
An Overview of oExchange
June 7, 2010, filed in: video
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