namespace Opus6
{
    using System;
    using System.Collections;

    [Copyright("Copyright (c) 2001 by Bruno R. Preiss, P.Eng."), Version("$Id: Multiset.cs,v 1.3 2001/09/11 12:04:04 brpreiss Exp $")]
    public interface Multiset : SearchableContainer, Container, IComparable, IEnumerable
    {
        Multiset Difference(Multiset set);
        bool Equals(Multiset set);
        Multiset Intersection(Multiset set);
        bool IsSubset(Multiset set);
        Multiset Union(Multiset set);
    }
}