This EventTypeis defined in OPC 10000-3. Its representation in the AddressSpaceis formally defined in Table 54.

Table 54– SemanticChangeEventType Definition

Attribute	Value
BrowseName	SemanticChangeEventType
IsAbstract	True
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseEventTypedefined in 6.4.2, which means it inherits the InstanceDeclarations of that Node.
HasProperty	Variable	Changes		SemanticChangeStructureDataType[]	PropertyType		Mandatory

This EventTypeinherits all Propertiesof the BaseEventType. Their semantic is defined in 6.4.2. There are no additional Propertiesdefined for this EventType. The SourceNode Propertyfor Events of this type shall be the Nodeof the Viewthat gives the context of the changes. If the whole AddressSpaceis the context, the SourceNode Propertyis set to the NodeIdof the Server Object. The SourceNamefor Eventsof this type shall be the Stringpart of the BrowseNameof the View, for the whole AddressSpaceit shall be “Server”.

The additional Propertydefined for this EventTypereflects the changes that issued the SemanticChangeEvent. Its structure is defined in 12.17.