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	public interface ITime // already strange to have an empty interface
	{
	}


	public interface ITimeSpan : ITime
	{
		ITimeStamp Start    {get;}
		ITimeStamp End      {get;}
	}

	public interface ITimeStamp : ITime
	{
		double ModifiedJulianDay {get;}
	}

        public interface ILinkableComponent
        {
                ITimeSpan TimeHorizon { get; }
                void Update(ITime time);
        }