1. personal data service
2. persona data server
3. personal data store
4. personal data ecosystem
The draft definitions are on the VRM wiki looking for participants.
Drafting down some thoughts:
personal data service
Individual control to put any data they own anywhere
personal data server
The technology layer used enable data control and portability.
personal data store
Understands the range of data stored and acts as data home of homes.
personal data ecosystem
Used to describe a WWW where personal data is the building blocks of communication.