Part 12 – Discovery
Part 12specifies how Discovery Serversoperate in different scenarios and describes how UA Clientsand Serversshould interact with them. It also defines how UA related information should be accessed using common directory service protocols such as LDAP.
Part 13 – Aggregates
Part 14 – PubSub
Part 14specifies the OPC Unified Architecture (OPC UA) PubSubcommunication model. The PubSubcommunication model defines an OPC UA publish subscribe pattern in addition to the Client Serverpattern defined by the Servicesin Part 4.