| Description | string | The basic execution service (BES)is a service to which clients can send requests to initiate, monitor, and manage computational activities and access information about the BES. A BasicExecutionService can act on one or more execution environments - modeled, profiled, and instantiated as a ComputerSystem. There is no requirement that a BasicExecutionService reside on the node of a ComputerSystem on which it acts. The associations ServiceAvailToElement and ServiceAffectsElement relate the BasicExecutionService to ComputerSystem. The association HostedDependency expresses the concept that an execution environment may be contained within another execution environment. For example, in a grid or distributed/virtualized environment the whole point for not explicitly stating which execution environment to use up front is to allow some client software, e.g. scheduler, orchestrator, provisioner, application, to determine where to place the activity (in which execution environment) based on the input activity document (that activity's environment/resource requirements). |