Part 12 (OPC 10000-12) – 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 (OPC 10000-13) – 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 (OPC 10000-14) – 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 OPC 10000-4.