C++ Based OPC UA Client/Server SDK  1.5.4.349
OPC UA Fundamentals

Most important to understand how to model and access information are the OPC UA specifications Part 3 and 4. These two specifications are the key documents for the design and development of OPC UA applications. This part of the documentation provides an abstract of these fundamentals of the OPC Unified Architecture. See OPC UA Specifications for a complete list of OPC UA specifications.