O2S resources are used by server-side application code, in the context of an O2S application framework. They are typically directed at server-side proxies which mediate resources, e.g. a multi_server that allocates resources associated with a particular server.
Each request is uniquely identified by a URI pointing to an XML specification. Currently the specifications are primitive, serving primarily as tokens to uniquely identify requests. The intention is for them to evolve to a rich mix of documentation, including formal specifications, man page style informal description, test and demonstration code, etc.