The Policies service provides operations to manage compute policies. A compute policy defines the intended behavior for a collection of vSphere objects identified by a tag. A compute policy is an instance of a capability. It is created by providing a value for the creation type specified by the capability. See Capabilities.Info.create-spec-type.
The Capabilities service provides operations to manage compute policy capabilities. The description of the capability provides information about the intent of a policy based on this capability. A capability provides a type to create a policy (see Policies.create). A capability also provides a type that describes the information returned when retrieving information about a policy (see Policies.get).
The TagUsage service provides operations to query which tags are used by policies.