Topicsis an instance of AliasNameCategoryType. Topicsshall restrict instances of AliasNameTypeto only have AliasFor Referencesthat point to PublishedDataSetType(or subtypes) instances (PublishedDataSetType is defined in OPC 10000-14). The Topics Nodeinstance is formally defined in Table 11.

Table 11– Topics definition

Attribute

Value

BrowseName

Topics

References

NodeClass

BrowseName

DataType

TypeDefinition

OrganizedBy by the Aliases defined in 9.2

HasTypeDefinition

ObjectType

AliasNameCategoryType

Defined in 6.3

ConformanceUnits

AliasName Category Topics

It can contain additional AliasNameCategoryType Objects, which could be used to create a hierarchy or other structure. A single instance of AliasNameTypecan exist in more than one location in the hierarchy, but all instances in the Topicshierarchy must point to an instance of a PublishedDataSetType.