- name parameterType -> parameterSlot - use for now same parameterSlot for xotcl1 + 2 - disallow unknown types (otherwise interpreted as user-types) in valuecheck
- allow syntax "object,type=::SomeClass" and "class,type=::SomeMetaClass" (currently identical, we should as well check for class/meta-class in case of "class,type=SomeClass")