How is a service contract just an expensive replacement for namespaces? Last time I looked service contracts allow methods to be implemented in SQL or Tcl and no Tcl namespace hack allows for that ...
Just to mention one difference.
How are they expensive? At startup time procs are built for each live method for each contract implementation and these are called directly when you invoke a method.
So there's a little startup time but not much else.
The main problem with service contract is that they're hard to change once they're defined...
