//   Visual Studio for Windows
__int64 __declspec(dllexport) __stdcall GetInstancePropertyByIteratorEx(
            __int64             model,
            __int64             owlInstance,
            __int64             rdfProperty

//   Linux, OS-X and non-Visual Studio Windows solutions
int64_t GetInstancePropertyByIteratorEx(
            int64_t             model,
            int64_t             owlInstance,
            int64_t             rdfProperty

Property model

Size: 64 bit / 8 byte (value)
The handle to the model. The model handle is static during its existance. Several models can be opened simultaniously within one session. Different models are always independent, threads are allowed to be running on different models simultaniously.

Property owlInstance

Size: 64 bit / 8 byte (value)
The handle to the specific instance in the design tree. The instance handle is static within one open model but is most probably different when the same instance is opened in another model. The instance is always exactly of one unique class.

Property rdfProperty

Size: 64 bit / 8 byte (value)
This attribute represents a handle to the property, this can be either a datatype property (attribute), an object property (relation) or non-defined property. The handle will be static during the life-time of the model, when the model (or part of it) is saved and opened again, the handle will most probably be different.