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Parametization on the Subtyped applications
The package parameters of xowiki are available for all instances of the package type myapp as well without further work. If one wishes to modify some parameters for myapp, the parameter definitions for these parameters have to be added via the apm package manager. This is currently a limitation mostly due to the editing front-end of package parameters, which is not aware package subclassing. This restriction can hopefully removed in the future.
Subtype applications have their own set of prototype pages (packages/myapp/www/prototypes), protoype pages are not inherited. See the s5 package for an example.