internal void AddBase(InterfaceType _base)
{
if (_base == null)
throw new ArgumentNullException("_base");
if (BaseList.Contains(_base)) {
throw new RelationshipException(
Strings.ErrorCannotAddSameBaseInterface);
}
if (_base.IsAncestor(this)) {
throw new RelationshipException(string.Format(Strings.ErrorCyclicBase,
Strings.Interface));
}
if (_base.Language != this.Language)
throw new RelationshipException(Strings.ErrorLanguagesDoNotEqual);
BaseList.Add(_base);
Changed();
}