Attending

Members of the Modelica Association (6):

John Batteh

Hilding Elmqvist

Chuck Newman

Hans Olsson

Martin Otter

Michael Tiller

Time Schedule

Topics to be discussed at the meeting

• Finish “improving replaceable” discussion.

• Model variant handling (continuing previous proposal "enable").

• Improved bus handling (proposals from Michael, Hans).

• Compatibility of Modelica.Fluid to engine modeling

• Handling of external databases (e.g. for product data, fluid properties, etc)

• The Vehicle Modeling Architecture (VMA) library

• Distribution of the library

• Handling of "bus" connectors

• Feedback on current design

• Adapting definition of “String(..)” builtin operator (Hans pointed out that there are some problems)

• Continue design of exception handling (try/catch/..) PELAB will show how it is done in Haskell.

• Further functions for scripting (especially plot, GUI)

• Working on Modelica 2.2 specification.

Possible Content of Modelica 2.2

At the design meeting in Dearborn, the specification text for Modelica 2.2 should be further continued. At the next meeting in January or February 2005 (before the Modelica'2005 conference), Modelica 2.2 should be released. Current decisions are:

37^th Meeting in Lund

• New builtin operators that return the “true” machine constants (proposal, no decision):
  MachineConstantInf()
  MachineConstantEps()
  MachineConstantSmall()
  MachineConstantMaxInt()
  MachineConstantMinInt()

• “==” operator is allowed in functions, e.g., in order that “norm(A, inf)” can be implemented. Already supported in Dymola but leads to a warning (proposal, no decision).
  
  
  

38^th Meeting in Munich

• Proposal for recursive inner/outer (unfortunately, proposal and discussion is not included in the minutes).
  This is needed in order that the StateGraph library can be included in the Modelica library.

• Proposal for improved replaceable, see minutes (no decision)

39^th Meeting in Lund

• Proposal for expressions in derivatives, der(rho*u) (useful for Modelica.Fluid library)

• Proposal for partial derivatives of functions (needed for Modelica.Media library)

40^th Meeting in Dresden

• Bus concept (needed for VMA)

41^th Meeting in Dearborn (planned)

• Improve replaceable

• Some support for enable

• Allow multiple algorithm and protected sections in functions. This completely unnecessary restriction leads to problems when using inheritance in functions.

• Adaption of String(..) builtin operator (fix bug)