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• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  6.4.4.4.4 OptionalPlaceholder
  ModellingRule OptionalPlaceholder is to expose the information that a complex TypeDefinition expects from instances of the TypeDefinition to add instances with specific References without defining BrowseNames for the instances ... with a HasComponent Reference . However, the names of the DeviceParameters are specific to the instances. The example is shown in Figure 35 , where an instance Device A adds two DeviceParameters
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  6.4.4.4.5 MandatoryPlaceholder
  intention as the ModellingRule OptionalPlaceholder . It exposes the information that a TypeDefinition expects of instances of the TypeDefinition to add instances defined by the InstanceDeclaration . However, MandatoryPlaceholder requires that ... least one of those instances shall exist. For example, when the DeviceType requires that at least one DeviceParameter shall exist without specifying the BrowseName for it, it uses MandatoryPlaceholder