Currently there's no validation of incoming FHIR payloads, right? I ran a local test, was able to create a Patient containing only

{ "resourceType": "Patient" }

Wondering if there's any plans to have a validation framework of sorts, maybe allowing an install or Project to set requirements for certain resources. For example, if I understand correctly, the spec states that a Patient should "at least contain a contact's details or a reference to an organization": http://hl7.org/fhir/patient.html#invs