Modified Types extend or modify the behavior of a regular type, to form more complex combinations, such as arrays, sequences, tuples or pointers of a given other type.
For example, value types can normally not be
nil, but the
nullable version of that same type can. And an
array can broaden what usually is a single copy of a given type into a group of several items of the same type that can be worked on in bulk.
Modified Types are defined by the Oxygene language itself, and are usually not referred to by name (although one can of course define an Alias to a specific modified type), but with a special language syntax.