Zero/ZeroLevel/Services/Specification/ISpecification.cs

namespace ZeroLevel.Specification
{
    public interface ISpecification<T>
    {
        bool IsSatisfiedBy(T o);
        ISpecification<T> And(ISpecification<T> specification);
        ISpecification<T> Or(ISpecification<T> specification);
        ISpecification<T> Not();
    }
}