Errata exists for this version of the document.

Part 12 – Discovery

Part 12 specifies how Discovery Servers operate in different scenarios and describes how UA Clients and Servers should 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 13 specifies how to compute and return aggregates like minimum, maximum, average etc. Aggregates can be used with current and historical data.

Part 14 – PubSub

Part 14 specifies the OPC Unified Architecture (OPC UA) PubSub communication model. The PubSub communication model defines an OPC UA publish subscribe pattern in addition to the Client Server pattern defined by the Services in Part 4.