VOID - Unknown type

Unknown types can be defined for references or transient fields (pointers), only. VOID references may refer to a collection or a single object instance with unknown type. The database will determine the instance type at run-time in this case.

In OSI, VOID is considered as base class for any other type, i.e. each complex data type inherits from VOID. This allows defining generic expressions in the VOID class. You may also implement virtual expression in VOID, which can be overloaded in derived classes.