The behavior of a component can be described as a function hierarchy in the
MSRSYS.DTD (
<behavior>). This description is independent of the implementation in hardware or software.
Realization the software is supported by
MSRSW.DTD. This is a design oriented on functions

. The relationship between functions in
MSRSYS.DTD and
MSRSW.DTD can be established by references (
<sw-fulfils>).