Differentiate performer (individual) from performer (role)

Background: The current profile reflects the community consensus minimum expectations for the Observation resource to record, search, and fetch retrieve observations that represent the questions and responses to form/survey and assessment tools such as the Protocol for Responding to and Assessing Patients’ Assets, Risks, and Experiences (PRAPARE) Survey. It is expected and encouraged that domain specific or implementation specific profile will build on the profile adding other elements and extensions for their use cases. Reasoning: Adding a Must Support for observation.performer may impose an undo burden on implementers whose systems do not support roles. These profile do not preclude or prevent implementations based on them from adding other profile elements to meet their use cases. Proposed Changes: There is no action needed by US Core on this issue.