190 Copyright © 2011 Open Geospatial Consortium
Table 77 — Connections of the Accepted state
Connector type
Source state
Target state
Notes Transition
ChoiceB Accepted If the tasking request is feasible, it transitions on to the final state Accepted.
If supported, the service shall notify interested consumers about this event.
10.2.2.3 ChoiceA
When receiving a tasking request, the service has to determine the feasibility of a tasking request within a reasonable amount of time. A reasonable time should be a duration that
is well below any timeout of the transport protocol used for the communication.
Table 78 — Connections of the ChoiceA choice
Connector type
Source state
Target state
Notes Transition
ChoiceA Pending If the service cannot determine the feasibility of a
tasking request in a reasonable amount of time, the request transitions into the Pending state.
If supported, the service shall notify interested consumers about this event.
Transition
ChoiceA ChoiceB If the service can determine the feasibility of a tasking request in a reasonable amount of time, the
request transitions on to the final decision point.
Transition
Initial State
ChoiceA A tasking request automatically reaches the choice
where the service decides whether the feasibility of the tasking request can be determined in a
reasonable time or not.
10.2.2.4 ChoiceB
Here the service makes his decision whether the request is feasible or not.
Copyright © 2011 Open Geospatial Consortium 191
Table 79 — Connections of the ChoiceB choice
Connector type
Source state
Target state
Notes Transition
ChoiceA ChoiceB If the service can determine the feasibility of a tasking request in a reasonable amount of time, the
request transitions on to the final decision point.
Transition
Pending ChoiceB
If the service can provide a final decision on the feasibility of a pending tasking request, the request
transitions on to the final decision point.
Transition
ChoiceB Accepted If the tasking request is feasible, it transitions on to the final state Accepted.
If supported, the service shall notify interested consumers about this event.
Transition
ChoiceB Rejected If the tasking request is not feasible, it transitions on to the final state Rejected.
If supported, the service shall notify interested consumers about this event.
10.2.2.5 Initial State
A tasking request is sent to the SPS GetFeasibility, Reserve, Submit, Update.
Table 80 — Connections of the Initial state
Connector type
Source state
Target state
Notes Transition
Initial State ChoiceA
A tasking request automatically reaches the choice where the service decides whether the
feasibility of the tasking request can be determined in a reasonable time or not.
10.2.2.6 Rejected Final State
If the service determines that the tasking request is not feasible, the request is in the final state Rejected.
If the tasking request had the intention to reserve or submit a task, then no task is scheduled by the service.
192 Copyright © 2011 Open Geospatial Consortium If the tasking request had the intention to update a reserved or currently executed task, the
update is not performed. A service may provide alternative sets of tasking parameters that the client can use to
formulate another tasking request.
Table 81 — Connections of the Rejected state
Connector type
Source state
Target state
Notes Transition
Pending Rejected If the latest response time was set by the client or service for a tasking request and this point in time
has been reached the current time being after the latest response time, the tasking request
automatically transitions into the Rejected state.
If supported, the service shall notify interested consumers about this event.
Transition
ChoiceB Rejected If the tasking request is not feasible, it transitions on to the final state Rejected.
If supported, the service shall notify interested consumers about this event.
10.2.3 EventsTrigger
Requirement http:www.opengis.netspecSPS2.0reqTaskingRequestsEventsTrigger
REQ 121. If an SPS server supports event notification, events shall be sent
as defined in clauses 10.2.3.1 to 10.2.3.3.
10.2.3.1 TaskingRequestAccepted
A tasking request has been accepted. If supported by the service, this causes a notification of the event.
10.2.3.2 TaskingRequestExpired
A pending tasking request has expired. If supported by the service, this causes a notification of the event.
