Data description code extension for HLA RTI

A Data Description Code (DDC) Extension is introduced to HLA RTI, which forwards refined Data filtering and Aspect Oriented Framework (AOF) to HLA simulation system. The section 1 and 2 respectively present the rationales of DDC based data filtering and AOF, and a design of DDC Extension and its test bed are detailed in the section 3 and 4. The DDC extension can improve run time efficiency and the architecture design of large scale HLA simulation system, while still holding the interfaces of both the local RTI Component (LRC) and the federate to keep compatible with conventional applications.