OK I think I found the actual intent of aq_base() in _checkId of PlugIns.py:

                if hasattr(aq_base(self), id):
                    # The object is located in this ObjectManager.
                    if not flags & REPLACEABLE:
                        raise 'Bad Request', ('The id "%s" is invalid - ' \
                              'it is already in use.' % id)
                    # else the object is replaceable even if the UNIQUE
                    # flag is set.
                elif flags & UNIQUE:
                    raise 'Bad Request', \
                          ('The id "%s" is reserved.' % id)

it comes from the ObjectManager _checkId which has basically the same
code execpt it ObjectManager.py also has the needed:

from Acquisition import aq_base

which PlugIns.py does not..  so looking at Acquisition.c it appears
that there is no real difference between

hasattr(aq_base(self), id)

which calls 

  if (WRAPPER(self)->obj)
    {
      r=WRAPPER(self)->obj;
      while (isWrapper(r) && WRAPPER(r)->obj) r=WRAPPER(r)->obj;
    }
  else r=Py_None;
  Py_INCREF(r);
  return r;

and hasattr( self.aq_base, id) which calls

    case 'b':
      if (strcmp(name,"base")==0)
        {
          if (self->obj)
            {
              r=self->obj;
              while (isWrapper(r) && WRAPPER(r)->obj) r=WRAPPER(r)->obj;
            }
          else r=Py_None;
          Py_INCREF(r);
          return r;
        }
      break;

Anyway.. it looks like either fix is OK... I guess!

-steve

>>>>> "Steve" == Steve Spicklemire <[EMAIL PROTECTED]> writes:

    Steve> ZPatterns 0.4.2a1 PlugIns.py bug?

    Steve> I get a 'Name Error' aq_base when I hit the following code
    Steve> while trying to update the index_html method of one of my
    Steve> Specialists from CVSMixin.. I think that this would get hit
    Steve> anytime you add an object whose id is already in the
    Steve> acquisition path....

    Steve> -steve

    Steve> diff -c -r1.1.1.2 PlugIns.py *** PlugIns.py 2000/09/04
    Steve> 14:17:29 1.1.1.2 --- PlugIns.py 2000/09/04 18:53:17
    Steve> *************** *** 265,271 **** # An object by the given
    Steve> id exists either in this # ObjectManager or in the
    Steve> acquisition path.  flags = getattr(obj, '__replaceable__',
    Steve> NOT_REPLACEABLE) !  if hasattr(aq_base(self), id): # The
    Steve> object is located in this ObjectManager.  if not flags &
    Steve> REPLACEABLE: raise 'Bad Request', ('The id "%s" is invalid
    Steve> - ' \ --- 265,271 ---- # An object by the given id exists
    Steve> either in this # ObjectManager or in the acquisition path.
    Steve> flags = getattr(obj, '__replaceable__', NOT_REPLACEABLE) !
    Steve> if hasattr(self.aq_base, id): # The object is located in
    Steve> this ObjectManager.  if not flags & REPLACEABLE: raise 'Bad
    Steve> Request', ('The id "%s" is invalid - ' \

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