public Collection4 ForInterface(IReflectClass claxx)
        {
            Collection4           col = new Collection4();
            ClassMetadataIterator i   = Iterator();

            while (i.MoveNext())
            {
                ClassMetadata clazz     = i.CurrentClass();
                IReflectClass candidate = clazz.ClassReflector();
                if (!candidate.IsInterface())
                {
                    if (claxx.IsAssignableFrom(candidate))
                    {
                        col.Add(clazz);
                        IEnumerator j = new Collection4(col).GetEnumerator();
                        while (j.MoveNext())
                        {
                            ClassMetadata existing = (ClassMetadata)j.Current;
                            if (existing != clazz)
                            {
                                ClassMetadata higher = clazz.GetHigherHierarchy(existing);
                                if (higher != null)
                                {
                                    if (higher == clazz)
                                    {
                                        col.Remove(existing);
                                    }
                                    else
                                    {
                                        col.Remove(clazz);
                                    }
                                }
                            }
                        }
                    }
                }
            }
            return(col);
        }