Interface Definition Language means the deklarative formal language and contains a language syntax for the description of interfaces of the software component. With their assistance objects can be described with the possible parameters and data types. It serves purely the description, not the formulation of algorithms. Due to the modules of the system VICOS OC 501 I developed an appropriate interface definition lanuage with XML in this work, i.e. a self-defining XML schema to produce. With the structure this schema one can generate XML documents, which describe the data of the system. To simple produce and oprate XML documents, I made still another Design of the graphical user interface. On it the model of VICOS OC 501, which corresponds to the system XML schema, can be schematically created. And through the operations on the graphical user interface one can also operate the appropriate XML document. In addition I still defined another XML schema, in order to store the information about graphical user interface and data of the system with its structure in the XML document. The last part of the thesis (diploma) concerns itself with the prototyping. Hier prototypes are described.