http://www.imsglobal.org/af/index.cfm
“The IMS Abstract Framework (IAF) is a device to enable the IMS to describe the context within which it will continue to develop its eLearning technology specifications. This framework is not an attempt to define the IMS architecture, rather it is a mechanism to define the set of services for which IMS may or may not produce a set of interoperability specifications.” It’s hard to describe how huge this is. A lot of work has gone into this. It is not for the faint of heart. Start with the white paper, that alone is worth a few days or reading and digesting, and is invaluable for the appendices alone. – SWL