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2 result(s) for InstanceDeclaration,

• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  6.4.4.4.4 OptionalPlaceholder
  TypeDefinition . It just provides useful information when exposing a TypeDefinition . When the InstanceDeclaration is complex, i.e. it references other InstanceDeclarations with hierarchical References , these InstanceDeclarations are not further considered ... InstanceDeclarations having the OptionalPlaceholder ModellingRule should be enclosed within angle brackets. When overriding the InstanceDeclaration, the ModellingRule shall remain OptionalPlaceholder . For Methods, the ModellingRule OptionalPlaceholder is used to define
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  6.4.4.4.5 MandatoryPlaceholder
  TypeDefinition expects of instances of the TypeDefinition to add instances defined by the InstanceDeclaration . However, MandatoryPlaceholder requires that at least one of those instances shall exist. For example, when ... requires that each instance provides at least one instance with the TypeDefinition of the InstanceDeclaration or a subtype, and is referenced with the same ReferenceType or a subtype