Here is a simpler example for creating a hierarchical data model using private attributes. This models a control system in a factory with 2 pumps. The sample file shown below will create a point hierarchy in the default data domain that looks like this:

; Create two assemblies.
(assembly testdomain factory)
(assembly testdomain pump)

; Create two subassemblies.
(subassembly testdomain factory pump pump1)
(subassembly testdomain factory pump pump2)

; Assign private attributes.
(private_attribute testdomain pump flow R8 rw 0 100)
(private_attribute testdomain pump amps R8 rw 0 100)
(private_attribute testdomain pump onoff BOOL rw 0 100)

; Instantiate the model.
(instance testdomain factory1 factory)