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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.1.3 Determining if a Certificate is trusted
  trust. An Application decides if another application is trusted by checking whether the ApplicationInstanceCertificate for the other application is trusted. A Certificate is only trusted if its chain ... types of Certificates . Some steps are skipped if the Certificate is not an ApplicationInstanceCertificate. ApplicationInstanceCertificates shall not be used in a Client or Server until they have been evaluated