respond-behaviour.txt

response payload calculation:

request.respond()
	-> retrieve
		-> OK, request.target.transform( request.target.properties, request.options )
	-> update
		-> OK, no payload [1]
	-> delete
		-> OK, no payload [1]
	-> create
		-> INTERNAL_SERVER_ERROR, reject( "Missing payload" )

request.respond( data )
	-> data instanceof Resource
		-> retrieve
			-> OK, data.transform( data.properties, request.options )
		-> update
			-> OK, data.transform( data.properties, request.options ) [0]
		-> delete
			-> OK, data.transform( data.properties, request.options ) [0]
		-> create
			-> isValidResource( data )
				-> RESOURCE_CREATED, data
			-> resource not valid
				-> INTERNAL_SERVER_ERROR, reject( "payload not a resource" )

	-> data is plain object
		-> retrieve
			-> OK, request.target.transform( data, request.options )
		-> update
			-> OK, request.target.transform( data, request.options ) [0]
		-> delete
			-> OK, request.target.transform( data, request.options ) [0]
		-> create
			-> isValidResource( data )
				-> RESOURCE_CREATED, data
			-> resource not valid
				-> INTERNAL_SERVER_ERROR, reject( "payload not a resource" )

[0] Should these be "no payload", even if data was given?
[1] Conversely to [0], should these be
    request.target.transform( request.target.properties, request.options )
    like the "retrieve" case?

[0] Should these be "no payload", even if data was given?

Depends (based on the OCF spec): for update it MAY have data, for delete it doesn't have data.