[Models] alias object class

["Vithalprasad Gaitonde" <gvithalprasad@novell.com>]

An entry with the 'alias' object class must also belong to an object
  class (or classes), or be governed by a DIT content rule, which
allows
  suitable naming attributes to be present.

Since alias is a structural class, an entry belonging to this class can
belong to only other auxilliary classes not other sturctural classes.
Auxilliary classes cannot have nameforms. Thus the question of what
naimg attribute to use for an  entry which is an alias is not
indeterminate.

Comments?

Prasad