9.33 SemanticChangeEventType

9.33.1 General

SemanticChangeEvents are Events of SemanticChangeEventType that are generated to indicate a change of the AddressSpace semantics. The change consists of a change to the Value Attribute of a Property.

The SemanticChangeEvent contains information about the Node owning the Property that was changed. If this is a Variable or Object, the TypeDefinitionNode is also present.

The SemanticChange bit of the AccessLevel Attribute of a Property indicates whether changes of the Property value are considered for SemanticChangeEvents (see 5.6.2).

9.33.2 ViewVersion and NodeVersion Properties

The ViewVersion and NodeVersion Properties do not change due to the publication of a SemanticChangeEvent.

9.33.3 Views

SemanticChangeEvents are handled in the context of a View the same way as ModelChangeEvents. This is defined in 9.32.3.

9.33.4 Event compression

SemanticChangeEvents can be compressed the same way as ModelChangeEvents. This is defined in 9.32.4.