Instances of the AliasNameType ObjectType provide alternate names for Nodes. The AliasNameType is formally defined in Table 1.

Table 1 – AliasNameType Definition

Attribute		Value
BrowseName		AliasNameType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseObjectType defined in OPC 10000-5
ConformanceUnits
AliasName Base

This ObjectType has no Properties or Variables. The BrowseName of the Object is used as the alias name. The string part of the BrowseName shall be the DisplayName with an empty locale id and no other locale shall be provided. This Object shall have at least one AliasFor Reference (or sub-type).

A Client shall always ignore the namespace associated with an AliasName for comparison with other AliasNames.

The AliasName Object’s BrowseName shall not be modified once it is defined. If an AliasName needs to be changed, it is considered as a deletion of the old AliasName and the addition of new AliasName. This requirement allows AggregatingServers to detect new AliasNames.