This interface is a minimal extension to the standard java.util.List interface, making it easier to use RTI Connext alongside other Java APIs.
The java.util.List interface does not provide direct support for lists of primitive types. The DDSBuiltinSequenceModule provide extension APIs for working with collections of primitive elements without the overhead of boxing the unboxing.
When you use the rtiddsgen code generation tool, it will automatically generate concrete sequence instantiations for each of your own custom types.
See also: http://java.sun.com/javase/6/docs/api/java/util/List.html