DCA related Personalities are the first GTA API objects created for OPC UA. There would be one DCA TrustList Personality and one or more DCA Identity Personalities (corresponding to one or more DCA certificates). Figure 5 shows the object model for a DCA Personality Set.

Figure 5 – DCA Personality Set

By convention the identifier used to create DCA related Personalities shall be of type org.opcfoundation.application_instance_uri. The ProductInstanceUri is a natural choice for the identifier value used for the DCA Personality set. However, selection of the identifier value is left to the operator.

The application of a DCA Identity Personality shall be set to “DCA Identity” and the application of a DCA TrustList Personality shall be set to “DCA TrustList”. This allows easy selection of the DCA related Personalities using gta_personality_enumerate_application() (cf. ISO/IEC TS 30168, clause 6.6.10.4.12) during later use.

The name of the DCA Identity Personality is set according to the description in 4.3.2.2.

EXAMPLE

urn:manufacturer.com:2024-10:myproduct:SN51235?cg=DefaultApplicationGroup&ct=Rsa2048&ix=1

urn:manufacturer.com:2024-10:myproduct:SN51235?cg=DefaultApplicationGroup&ct=EccNistP256&ix=10

The DCA Certificate itself can be made available using a personality attribute of type ch.iec.30168.trustlist.certificate.self.x509. As the security of the DCA Certificate does not depend on additional protection offered by a secure element it may also be stored elsewhere.

The name of the TrustList personality is set according to the description in 4.3.2.2.

EXAMPLE

urn:manufacturer.com:2024-10:myproduct:SN51235?cg=DefaultApplicationGroup