public interface IWTDValueRange { DateTime Effectivefrom { get; set; } int LineNumber { get; } double Rate { get; set; } int SeqNum { get; } double ValueFrom { get; set; } void FromXMLFile( string bstrFileName); void FromXMLString( string bstrXML); string GetXMLSchema(); void ToXMLFile( string bstrFileName); string ToXMLString(); }