o6\Python SDK Fundamentals¶

OPC UA ships a fixed set of datatypes that every server and client must understand but also offers extensibility with custom types. In this chapter:

• Built-in types — 25 types: primitives, StatusCode, container types, address/identity types.
• Namespaces in o6\Python — How o6\Python abstracts from manual namespace managing
• Writing a Nodeset in Python — Declaring datatypes, enums, VariableTypes and ObjectTypes without any XML
• Implementing Object Behavior — The implement pattern: Method calls and Variable read/write behind a declared type

How the specification itself describes types, namespaces and nodeset files is covered in OPC UA Fundamentals — see DataType, Namespace and Nodeset Files & Companion Specs.

Datatypes, Object, Variables, References are all organized into Namespaces and distributed through nodeset xml files. o6\Python registers nodesets (NS0, a companion spec, or a vendor nodeset loaded at runtime) in a process-global registry and is identified by a short name, index, and URI.