Hello,

I noticed that the model DynamicPipe has via the extension of other models, the partial model PartialTwoPort two times in the declaration.
The definition of the model DynamicPipe reads

model DynamicPipe

   extends Modelica.Fluid.Pipes.BaseClasses.PartialStraightPipe

   ...

   extends BaseClasses.PartialTwoPortFlow

   ...

Thus PartialTwoPort is a first time via:
model DynamicPipe extends Modelica.Fluid.Pipes.BaseClasses.PartialStraightPipe ->
partial model  PartialStraightPipe extends Modelica.Fluid.Interfaces.PartialTwoPort

and a second time via:
model DynamicPipe extends extends BaseClasses.PartialTwoPortFlow ->
partial model PartialTwoPortFlow extends Modelica.Fluid.Interfaces.PartialTwoPort
present in the model.

Until now, I was not aware that such a construct would work. I must admit, that I have only little experience with modelica. In Fritzson's book OOMS with Modelica I could, however, not find an example discussing such a situation. If I want to write a new model MyDynamicPipe which is similar but not identical to DynamicPipe, do I have to pay attention, that the order of declaration is unchanged or something else?

al