Please note that all classes derived from the abstract class __D_swimlane__ must be included in a MODE. Although all other classes and relation classes are displayed even if no MODE is defined, you must define at least one mode if you want to use a class derived from the __D_swimlane__.
The piece of code below exemplifies the definition of a standard mode for the model type "Sample" (class Swimplane_Vertical has been derived from class __D_swimlane__):
1MODELTYPE "Sample" from:none plural:"Samples" pos:1
2INCL "A"
3INCL "B"
4INCL "C"
5INCL "Swimlane_Vertical"
6INCL "any2any"
7
8MODE "Standard" from: all