DSS2 — Table 15: MOM interaction class definitions table: HLArequestSubscriptions

Each HLAreportObjectClassSubscription interaction must, according to Table 17, contain four parameters: HLAnumberOfClasses, HLAobjectClass, HLAactive, and HLAattributeList. When a federate subscribes to object class attributes using only DM subscriptions, all attributes that are subscribed at a given class must necessarily be all subscribed with the same passive subscription indicator value (either passive or active). However, when a federate subscribes to object class attributes using DDM subscriptions, it is possible for the federate to be subscribed to the same attribute at a given object class both passively and actively (as long as they are subscribed with different regions). The parameter information present in the HLAreportObjectClassSubscription interaction is not flexible enough to both meet the constraint that at most one interaction of the class HLAmanager.HLAfederate.HLAreport.HLAreportObjectClassSubscription shall be sent for each object class subscribed, and to accurately convey whether these subscriptions are either active, passive, or both active and passive. The text must be changed in order to enable the service to accurately reflect DDM usage.

The definition of the HLAmanager.HLAfederate.HLArequest.HLArequestSuscriptions interaction says that this interaction shall result in one interaction of class HLAmanager.HLAfederate.HLAreport.HLAreportInteractionSubscription and one interaction of class HLAmanager.HLAfederate.HLAreport.HLAreportObjectClassSubscription for each object class published. Instead, it is recommended that the text be changed to say that it shall result in one interaction of class HLAmanager.HLAfederate.HLAreport.HLAreportInteractionSubscription and one interaction of class HLAmanager.HLAfederate.HLAreport.HLAreportObjectClassSubscription for each different combination of (object class, passive subscription indicator) values that are subscribed. (Note that the change of the word "published" to "subscribed in the suggested preceding revision is a correction of what is believed to be a typographical error.)

In other words, if a federate is subscribed to a given object class and class attribute with the same passive/active subscription indicator value either with multiple DDM subscriptions or with one or more DDM subscriptions and a DM subscription, that (object class, attribute, active/passive indicator) triple should only appear in one HLAmanager.HLAfederate.HLAreport.HLAreportObjectClass Subscription interaction that is sent. However, if a federate is subscribed to a given object class and class attribute with different passive/active subscription indicators (at least once actively and at least once passively), either with multiple DDM subscriptions or with one or more DDM subscriptions and a DM subscription, that (object class, attribute, active/passive indicator) triple should appear in two separate HLAmanager.HLAfederate.HLAreport.HLAreportObjectClass Subscription interactions that are sent, one of which has an HLAactive parameter value of HLAtrue, and one of which has an HLAactive parameter value of HLAfalse.

In addition, the HLAnumberOfClasses parameter shall represent the count of the number of different (object class, active/passive subscription indicator) values being reported. This number shall not exceed twice the number of different object classes that are subscribed.

Similarly, if a federate is subscribed to a given interaction class with the same active/passive subscription indicator value with both a DDM subscription and a DM subscription, that (interaction class, active/passive indicator) pair should appear only once in the HLAmanager.HLAfederate.HLAreport.HLAreportInteractionSubscription interaction that is sent. However, if a federate is subscribed to a given interaction class with different active/passive subscription indicators (once actively and once passively), once with a DDM subscription and once with a DM subscription, that (interaction class, active/passive indicator) pair should appear twice in the HLAmanager.HLAfederate.HLAreport.HLAreportInteractionSubscription interaction that is sent, once with an HLAactive parameter value of HLAtrue, and once with an HLAactive parameter value of HLAfalse.

see above