;Asserts that `depender` can be considered started but not running until `dependee` is satisfied.
ServiceDependency = <depends-on @depender any @dependee Dependee>.
;Describes a relationship from a dependent to some a dependee service: has it started? is it ready?
Dependee = ServiceStarted / ServiceRunning .
;Asserts that the service has the given milestone among its dependencies. If not otherwise specified, a service has the milestone `core` as a dependency.
ServiceMilestone = <service-milestone @serviceName any @milestone any>.