Specifies which properties to include and the mappings for them.

Indicates which content validation rules should be bypassed. Supported values are '*' (skip all validations), 'data' (skip data validation), and 'references' (skip reference validation). Values can be combined, empty or duplicated values are ignored, and any unknown values result in a validation error. Use with caution as this may allow creation of invalid content that could cause issues in production.

Indicates client preference for the response content as per IETF RFC7240. Currently only supports 'return=representation' which can be used to indicate a preference to receive a representation of the resource that has been altered in the response.