Ernst,
that's a bug in XGCONF. I am not sure if there is a bug filed about it, but XGCONF should not generate "&<something>" expressions for UArg types. The type UArg can accept both pointers to strings and pointers to external symbols. The expression "&Application0" could be either.
What you should do is edit the generated CFG script and use:
clock0Params.arg = $externPtr("Application0");
That makes it unambiguous that you are referencing an external symbol 'Application0'. I'll check if we already have a bug filed for it. Here is more info about externPtr and similar operators: http://rtsc.eclipse.org/docs-tip/The_XDCscript_Language#XDCscript_operators
I also filed a bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=439303
