12.16 ModelChangeStructureDataType

This structure contains elements that describe changes of the model. Its composition is defined in Table 254.

Table 254 - ModelChangeStructureDataType Structure
NameTypeDescription
ModelChangeStructure
DataType		structure

affected

NodeId NodeId of the Node that was changed. The client should assume that the affected Node has been created or deleted, had a Reference added or deleted, or the DataType has changed as described by the verb.

affectedType

NodeIdIf the affected Node was an Object or Variable, affectedType contains the NodeId of the TypeDefinitionNode of the affected Node. Otherwise it is set to null.

verb

Byte

Describes the changes happening to the affected Node.

The verb is an 8-bit unsigned integer used as bit mask with the structure defined in the following table:

FieldBitDescription
NodeAdded0Indicates the affected Node has been added.
NodeDeleted1Indicates the affected Node has been deleted.
ReferenceAdded2Indicates a Reference has been added. The affected Node may be either a SourceNode or TargetNode. Note that an added bidirectional Reference is reflected by two changes one with the affected Node being the SourceNode, and the second with the affected Node being the TargetNode.
ReferenceDeleted3Indicates a Reference has been deleted. The affected Node may be either a SourceNode or TargetNode. Note that a deleted bidirectional Reference is reflected by two changes one with the affected Node being the SourceNode, and the second with the affected Node being the TargetNode.
DataTypeChanged4This verb may be used only for affected Nodes that are Variables or VariableTypes. It indicates that the DataType Attribute has changed.
Reserved5:7Reserved for future use. Shall always be zero.

A verb may identify several changes on the affected Node at once. This feature should be used if event compression is used (see OPC 10000-3 for details).

Note that all verbs shall always be considered in the context where the ModelChangeStructureDataType is used. A NodeDeleted may indicate that a Node was removed from a view but still exists in other Views.

Its representation in the AddressSpace is defined in Table 255.

Table 255 - ModelChangeStructureDataType definition
Attributes Value
BrowseNameModelChangeStructureDataType
IsAbstractFALSE
References NodeClass BrowseName DataType TypeDefinition ModellingRule
Subtype of the Structure DataType defined in Table 196.
Conformance Units
Base Info Model Change General