/// <summary>
		/// Enumeration valued field.
		/// </summary>
		/// <param name="Node">Node</param>
		/// <param name="FieldName">Name of field</param>
		/// <param name="StringIds">Corresponding String IDs</param>
		/// <param name="Timepoint">Timepoint of field value.</param>
		/// <param name="Value">Value</param>
		/// <param name="Type">Type of value.</param>
		public FieldEnum(string NodeId, string FieldName, FieldLanguageStep[] StringIds, DateTime Timepoint,
			Enum Value, ReadoutType Type)
			: base(NodeId, FieldName, StringIds, Timepoint, Type)
		{
			this.value = Value.ToString();
			this.dataType = Value.GetType ().FullName;
		}

		/// <summary>
		/// Represents a request for sensor data.
		/// </summary>
		/// <param name="Types">Readout types to read.</param>
		/// <param name="From">From what timestamp readout is desired.</param>
		/// <param name="To">To what timestamp readout is desired.</param>
		/// <param name="Nodes">Nodes to read.</param>
		public ReadoutRequest (ReadoutType Types, DateTime From, DateTime To, NodeReference[] Nodes)
		{
			this.types = Types;
			this.from = From;
			this.to = To;
			this.nodes = Nodes;
		}

		/// <summary>
		/// Numeric valued field.
		/// </summary>
		/// <param name="Node">Node</param>
		/// <param name="FieldName">Name of field</param>
		/// <param name="StringId">Corresponding String ID</param>
		/// <param name="Timepoint">Timepoint of field value.</param>
		/// <param name="Value">Value</param>
		/// <param name="Type">Type of value.</param>
		public FieldNumeric(string NodeId, string FieldName, int StringId, DateTime Timepoint,
			long Value, ReadoutType Type)
			: base(NodeId, FieldName, StringId, Timepoint, Type)
		{
			this.unit = string.Empty;
			this.value = Value;
			this.nrDecimals = 0;
		}

		/// <summary>
		/// Base class of all field values.
		/// </summary>
		/// <param name="NodeId">Node ID</param>
		/// <param name="FieldName">Name of field</param>
		/// <param name="StringIds">Corresponding String IDs</param>
		/// <param name="Timepoint">Timepoint of field value.</param>
		/// <param name="Type">Type of value.</param>
		public Field (string NodeId, string FieldName, FieldLanguageStep[] StringIds, DateTime Timepoint, ReadoutType Type)
		{
			this.nodeId = NodeId;
			this.fieldName = FieldName;
			this.timepoint = Timepoint;
			this.type = Type;
			this.languageModule = null;
			this.stringIds = StringIds;
			this.status = FieldStatus.AutomaticReadout;
		}

		/// <summary>
		/// Exports an enumeration field.
		/// </summary>
		/// <param name="Xml">XML Output</param>
		/// <param name="FieldName">Field name.</param>
		/// <param name="Value">Value.</param>
		/// <param name="Type">Type.</param>
		/// <param name="Status">Status.</param>
		public static void ExportField (XmlWriter Xml, string FieldName, Enum Value, ReadoutType Type, FieldStatus Status)
		{
			ExportField (Xml, new FieldEnum (string.Empty, FieldName, (FieldLanguageStep[])null, DateTime.MinValue, Value, Type, Status));
		}

		/// <summary>
		/// Exports an enumeration field.
		/// </summary>
		/// <param name="FieldName">Field name.</param>
		/// <param name="Value">Value.</param>
		/// <param name="Type">Type.</param>
		/// <param name="Status">Status.</param>
		public void ExportField (string FieldName, Enum Value, ReadoutType Type, FieldStatus Status)
		{
			Export.ExportField (this.turtle, FieldName, Value, Type, Status);
		}

		/// <summary>
		/// DateTime valued field.
		/// </summary>
		/// <param name="Node">Node</param>
		/// <param name="FieldName">Name of field</param>
		/// <param name="StringId">Corresponding String ID</param>
		/// <param name="LocalizationSeed">Localization seed, i.e. the default string for creating
		/// a localized field name.</param>
		/// <param name="Timepoint">Timepoint of field value.</param>
		/// <param name="Value">Value</param>
		/// <param name="Type">Type of value.</param>
		public FieldDateTime(string NodeId, string FieldName, int StringId, string LocalizationSeed,
			DateTime Timepoint, DateTime Value, ReadoutType Type)
			: base(NodeId, FieldName, StringId, LocalizationSeed, Timepoint, Type)
		{
			this.value = Value;
		}

		/// <summary>
		/// Exports a TimeSpan field.
		/// </summary>
		/// <param name="FieldName">Field name.</param>
		/// <param name="Value">Value.</param>
		/// <param name="Type">Type.</param>
		/// <param name="Status">Status.</param>
		public void ExportField (string FieldName, TimeSpan Value, ReadoutType Type, FieldStatus Status)
		{
			Export.ExportField (this.xml, FieldName, Value, Type, Status);
		}

		private static void Export (ISensorDataExport Output, IEnumerable<Record> History, ReadoutType Type, ReadoutRequest Request)
		{
			if ((Request.Types & Type) != 0)
			{
				foreach (Record Rec in History)
				{
					if (!Request.ReportTimestamp (Rec.Timestamp))
						continue;

					Output.StartTimestamp (Rec.Timestamp);

					if (Request.ReportField ("Temperature"))
						Output.ExportField ("Temperature", Rec.TemperatureC, 1, "C", Type);

					if (Request.ReportField ("Light"))
						Output.ExportField ("Light", Rec.LightPercent, 1, "%", Type);

					if (Request.ReportField ("Motion"))
						Output.ExportField ("Motion", Rec.Motion, Type);

					Output.EndTimestamp ();
				}
			}
		}