As an ONAP Developer, I need a facility that enables the concise specification of concrete coordination directives (e.g., "when closed loop A wants to run and closed loop B has open actions, then block closed loop A"). This user story (1) defines and implements a concise yaml format for writing coordination directives and (2) implements the facility to ingest a conforming yaml specification and generate a corresponding xacml policy that, when inserted into the xacml pdp, implements the coordination directive.