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An area is a specialization of a node and is a collection of other areas or sources. Areas are intended for arbitrary hierarchical
structuring of sources for various usages (for example, areas for authority or responsibility).
DAIS::AlarmsAndEvents::Area::IHome is used for browsing the area hierarchy. The find methods in the interface correspond to
the IOPCEventAreaBrowser with the filter type parameter set to OPC_AREA. The interface also implements the following OPC methods:
• IOPCEventServer::EnableConditionByArea()
• IOPCEventServer::DisableConditionByArea().
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Figure 5-8 DAIS alarms and events area IDL in UML