They have a couple Data Models: Calendars [0] is a simple Event + Attendees model Contacts [1] Re-uses vCard Mail [2] wants RFC 2822 compliant strings Photos [

They have a couple Data Models: Calendars [0] is a simple Event + Attendees model Contacts [1] Re-uses vCard Mail [2] wants RFC 2822 compliant strings Photos [3] have just basic metadata with a URL to fetch pixels Tasks [4] is a simple to-do model Overall the data model seems like a significant amount of wheel-reinvention. These data models are all just JSON records... they should be JSON-LD with @context pointing to a shared schema, probably defined at schema.org. [0] https://github.com/google/data-transfer-project/tree/master/portability-types-transfer/src/main/java/org/datatransferproject/types/transfer/models/calendar https://github.com/google/data-transfer-project/tree/master/... [1] https://github.com/google/data-transfer-project/blob/master/portability-types-transfer/src/main/java/org/datatransferproject/types/transfer/models/contacts/ContactsModelWrapper.java https://github.com/google/data-transfer-project/blob/master/... [2] https://github.com/google/data-transfer-project/tree/master/portability-types-transfer/src/main/java/org/datatransferproject/types/transfer/models/mail https://github.com/google/data-transfer-project/tree/master/... [3] https://github.com/google/data-transfer-project/tree/master/portability-types-transfer/src/main/java/org/datatransferproject/types/transfer/models/photos https://github.com/google/data-transfer-project/tree/master/... [4] https://github.com/google/data-transfer-project/tree/master/portability-types-transfer/src/main/java/org/datatransferproject/types/transfer/models/tasks https://github.com/google/data-transfer-project/tree/master/...