public abstract class VTQ
    {
        /// <summary>
        /// Gets the value of the data item.
        /// </summary>
        public abstract DataValue Value { get; }
        /// <summary>
        /// Gets the quality and status of the data item.
        /// </summary>
        public abstract QualityStatus QualityStatus { get; }
        /// <summary>
        /// Gets the time stamp represented in UTC.
        /// </summary>
        public abstract DateTime Timestamp { get; }
    }

public class Value
    {
        /// <summary>
        /// Gets or sets the raw data value contained in this class.
        /// </summary>
        public abstract object RawValue { get; }
        /// <summary>
        /// Gets the value as type Integer.
        /// </summary>
        public abstract int ValueAsInt32 { get; }
        /// <summary>
        /// Gets the value as type Float.
        /// </summary>
        public abstract float ValueAsFloat { get; }
        /// <summary>
        /// Gets the value as type Double.
        /// </summary>
        public abstract double ValueAsDouble { get; }
        /// <summary>
        /// Gets the value as type String.
        /// </summary>
        public abstract string ValueAsString { get; }
        /// <summary>
        /// Gets the value as type DateTime.
        /// </summary>
        public abstract DateTime ValueAsDateTime { get; }
        /// <summary>
        /// Gets the value as type Duration.
        /// </summary>
        public abstract TimeSpan ValueAsDuration { get; }
        /// <summary>
        /// Gets the value as type bool.
        /// </summary>
        /// <value><c>true</c> if [value as bool]; otherwise, <c>false</c>.</value>
        public abstract bool ValueAsBool { get; }
        /// <summary>
        /// Gets a value indicating whether this instance is empty
        /// </summary>
        /// <value><c>true</c> if this instance is empty; otherwise, <c>false</c>.</value>
        public abstract bool IsEmpty { get; }

        /// <summary>
        /// Gets a value indicating whether the value is an array.
        /// </summary>
        /// <value><c>true</c> if this instance is array; otherwise, <c>false</c>.</value>
        public abstract bool IsArray { get; }
        /// <summary>
        /// Gets the array value if the value is holding an array.
        /// </summary>
        /// <returns></returns>
        public abstract Array Array { get; }
        /// <summary>
        /// Gets the number of elements in the array if the value is holding array data.
        /// </summary>
        /// <returns>The number of elements in the array.</returns>
        public abstract int ArraySize { get; }
        /// <summary>
        /// If the value is holding an array, this returns an element from the array.
        /// </summary>
        /// <param name="elementIndex">value of elementindex</param>
        /// <returns>object value</returns>
        public abstract object GetArrayElement(int elementIndex);
    }

    public abstract class QualityStatus
    {
        /// <summary>
        /// This defines the bits when the quality does not exist.
        /// </summary>
        public const int QualityNotExist = -1;
        /// <summary>
        /// Gets the status setting enum.
        /// </summary>
        public abstract StatusSettingType StatusSetting { get; }
        /// <summary>
        /// The data quality follows OPC UA standard, or QualityNotExist if it does not exist.
        /// </summary>
        public abstract int OpcUaQuality { get; }
       
        /// <summary>
        /// The data quality used by ArchestrA, or QualityNotExist if it does not exist.
        /// </summary>
        public abstract int MxQuality { get; }

        /// <summary>
        /// Returns true if the quality is good.
        /// </summary>
        /// <returns>True if good</returns>
        public abstract bool IsGood();

        /// <summary>
        /// Returns true if the quality is bad.
        /// </summary>
        /// <returns>True if bad</returns>
        public abstract bool IsBad();
        /// <summary>
        /// Returns true if the quality is uncertain.
        /// </summary>
        /// <returns>True if uncertain</returns>
        public abstract bool IsUncertain();
        /// <summary>
        /// Returns true if the quality is initializing.
        /// </summary>
        /// <returns>True if initializing</returns>
        public abstract bool IsInitializing();
    }

    public enum StatusSettingType : byte
    {
        /// <summary>
        /// Represents a Communication Error type.
        /// </summary>
        Communication = 0,
        /// <summary>
        /// Represents a Configuration Error type.
        /// </summary>
        Configuration = 1,
        /// <summary>
        ///  Represents a Pending Error type.
        /// </summary>
        Pending = 2,
        /// <summary>
        ///  Represents an Operational Error type.
        /// </summary>
        Operational = 3,
        /// <summary>
        ///  Represents a Software Error type.
        /// </summary>
        Software = 4,
        /// <summary>
        ///  Represents a Security Error type
        /// </summary>
        Security = 5,
        /// <summary>
        ///  Represents a Warning Error type.
        /// </summary>
        Warning = 6,
        /// <summary>
        ///  Represents Out Of Service.
        /// </summary>
        OutOfService = 7,
        /// <summary>
        ///  Represents a Device Failure.
        /// </summary>
        DeviceFailure = 8,
        /// <summary>
        ///  Represents a Bad Error type.
        /// </summary>
        Bad = 9,
        /// <summary>
        ///  Represents an Uncertain Error type.
        /// </summary>
        Uncertain = 10,
        /// <summary>
        ///  Represents an Initializing Error type.
        /// </summary>
        Initializing = 11,
        /// <summary>
        ///  Represents Good status.
        /// </summary>
        Good = 12,
        /// <summary>
        ///  Represents an Unknown type.
        /// </summary>
        Unknown = 13
    }