For a definition of ModellingRules, see 188.8.131.52. Other parts of this series of standards may define additional ModellingRules. ModellingRules are an extendable concept in OPC UA; therefore vendors may define their own ModellingRules.
Note that the ModellingRules defined in this standard do not define how to deal with non-hierarchical References between InstanceDeclarations, i.e. it is Server-specific if those References exist in an instance hierarchy or not. Other ModellingRules may define behaviour for non-hierarchical References between InstanceDeclaration as well.
ModellingRules are represented in the AddressSpace as Objects of the ObjectType ModellingRuleType. There are some Properties defining common semantic of ModellingRules. This edition of this standard only specifies one Property for ModellingRules. Future editions may define additional Properties for ModellingRules. OPC 10000-5 specifies the representation of the ModellingRule Objects, their Properties and their type in the AddressSpace. The semantic of the Properties for ModellingRules is defined in 184.108.40.206.
Subclause 220.127.116.11 defines how the ModellingRule may be changed when instantiating InstanceDeclarations with respect to the Properties. Subclause 18.104.22.168 defines how the ModellingRule may be changed when overriding InstanceDeclarations in subtypes with respect to the Properties.