Carlos, yes, in fact I expect this is going to be a focal point of Sovrin development. Per my answer to another question you posted, one of the things I bring to the table is the work of the OASIS XDI Technical Committee on the XDI semantic data interchange protocol. Markus Sabadello, who is also active in the forum, is the co-chair of the XDI TC.
In short, if Sovrin agents use a standard XDI interface, we can establish very broad interoperability without constraining the richness or variety of data that can be shared in the Sovrin ecosystem.
XDI is still young, but you can review the XDI Core 1.0 Working Draft 01 spec to get a good sense for the underlying graph model. We are nearinig completion of a simplified JSON serialization format called JXD that will make XDI much more approachable for developers (it does for XDI what JSON-LD does for RDF).
Happy to discuss further on future Sovrin User Group calls, or to arrange an in-depth call just on this subject.