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• OPC-10000-16 – OPC Unified Architecture - Part 16: State Machines
  4.6.3 HasGuard
  HasGuard The HasGuard ReferenceType is a concrete ReferenceType and can be used directly. It is a subtype of HasComponent . The semantic of this ReferenceType is to point from a Transition ... Variable of the VariableType GuardVariableType or one of its subtypes. The representation of the HasGuard ReferenceType in the AddressSpace is specified in Table 21 . Table 21 - HasGuard ReferenceType Attribute Value
• OPC-10000-16 – OPC Unified Architecture - Part 16: State Machines
  4.6.4 GuardVariableType
  Only if the semantic is "True", the Transition connected via a HasGuard Reference can be used. The value of the GuardVariableType provides the semantic of the Guard