Control Loop Update handles creation, change, and deletion of control loops on participants. Change of control loops uses a semantic versioning approach and follow the semantics described on the page TOSCA Defined Control Loops: Architecture and Design#4.1ControlLoopVersionManagement.

Sequence diagram to be referenced in 

https://wiki.onap.org/display/DW/The+CLAMP+Control+Loop+Participant+Protocol

Please be aware of the addition of a "start_phase" in the Control Loop Element. take this into account in the design, see lines 46 to 50 in:
https://github.com/onap/policy-clamp/blob/master/common/src/main/resources/tosca/ControlLoopTOSCAServiceTemplateTypes.yaml