As described in 4.2.2 the main organization criteria for objects used with GTA API are identifiers and personality names. To allow easy retrieval of the required personality by an OPC UA application the following naming conventions shall be observed.

GTA API identifiers created for exclusive use by OPC UA shall be of type org.opcfoundation.product_instance_uri or org.opcfoundation.application_instance_uri and their respective value shall be set to the ProductInstanceUri or ApplicationUri respectively.

Adhering to this convention allows convenient enumeration of all personalities belonging to a specific ProductInstanceUri or ApplicationUri using gta_personality_enumerate() or direct selection of a personality using its personality name.

GTA API personality names shall be set to an URI query string<InstanceUri>?cg=<CertificateGroup>[&ct=<CertificateType>&ix=<GenerationIndex>]

where

• <InstanceUri > is either the ProductInstanceUri or the ApplicationUri
• <CertificateGroup> is the Name portion of the BrowseName for the OPC UA CertificateGroup (e.g., “DefaultApplicationGroup”), and
• <CertificateType> is the Name portion of the BrowseName for the OPC UA CertificateType (See OPC 10000-12) where any trailing “ApplicationCertificateType” is removed, “EccNistP256ApplicationCertificateType” “EccNistP256”
• <GenerationIndex> is a monotonically increasing number that can be used to distinguish between different versions of the personality. Multiple versions can exist during an update process which takes time to complete.

CertificateType and GenerationIndex are not present for the personality representing the TrustList for the CertificateGroup.