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JSR 170 is the Content Repository API for Java. It specifies a standard API to access content repositories in Java independent of implementation. (See also its follow-on: JSR 283 Content Repository API version 2.0). Neither Fedora nor Sakai have JSR-170 interfaces, although if they did it could be a point of integration. Implementation of JSR-170/283 would be a new implementation of the Sakai ContentHostingService API.
See JSR-170 for Ian Boston's description of a JSR-170 Implementation of ContentHostingService as a prototype against the then Trunk 2.2 ContentHostingService.
AFS interface
UC Davis people have home directories in AFS space, and their course management system also utilizes this space. UC Davis has a problem statement for integrating the user home directory AFS space into Sakai.
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(Note: this document was originally posted to the web as Fedora plus Sakai: A view from 30,000 feet. That version will not be updated; this version is considered authoritative.)