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Sakai OAE exposes APIs at a number of levels. There are the standard Java APIs expressed as interfaces, describing service isolation, deployed as OSGi bundles within an OSGi1 container. We use Apache Felix. These APIs operate at conceptual levels such as Content, Activitites, Social Connections, User and Groups.... to name a few.

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Further out the app server processes expose RESTfull interfaces. These are almost entirely of the flavour expressed by Roy Fielding2, and mostly conform to the protocol expressed by Apache Sling3. Like Atom, we deal with URLs (URIs) that point to Resources, and then perform actions on those resources based on the HTTP method and the parts of the URL that are not the URI to the Resource itself. Our RESTfull interfaces are rarely bound to fixed locations (eg not /db/record/12312342) and have meaning (eg /user/ieb/profile.json or /pyhsics/course101.allcontent.json ). Unlike Atom we use json almost exclusively.

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1 http://en.wikipedia.org/wiki/OSGi
2 http://roy.gbiv.com/untangled/2008/rest-apis-must-be-hypertext-driven
3 http://sling.apache.org/site/url-decomposition.html
4 https://github.com/ieb/sparsemapcontent