The non-contextual content of a WITSML Log. Whether or not the log is growing. True ("true" or "1") indicates the that the log is still growing in size (that is, logData values are still being added). For example, it may be connected to a realtime stream. False ("false" or "0") indicates that the log is closed (that is, no further logData values will be added). Not given indicates that the status of the log is not known. This value is only relevant within the context of a server. The number of data rows in the persistent log. If a value is specified for this element in a query then the server will limit the number of data rows in the result but the return value will still be the number of data rows in the persistent log. Name of contractor who provided the service. Log run number. This should normally be a number; however some legacy systems encode other information in this value. The bottom hole assembly run number associated with this log. Identifies the pass within the run. Date and time that the log was created. Description of item and details. Primary index type. The index may be a quantity type or it may be a dateTime type. At least one of the index sets must be given. If both are given then "indexType" and "indexCurve" must represent an elapsed time from "startDateTimeIndex". The start and end indexes are server query parameters and will be populated with valid values in a GetFromStore result. When the log header defines the direction as "Increasing", the startIndex is the starting (minimum) index value at which the first valid data point is located. When the log header defines the direction as "Decreasing", the startIndex is the starting (maximum) index value at which the first valid data point is located. When the log header defines the direction as "Increasing", the endIndex is the ending (maximum) index value at which the last valid data point is located. When the log header defines the direction as Decreasing, the endIndex is the ending (minimum) index value at which the last valid data point is located. The sampling increment. Set to zero for unequal sampling. This would only apply if the curve was sorted on its own values. For curves that are originally sampled at a constant increment, this value should be retained because the calculated values may have cumulative errors. When the log header defines the direction as "Increasing", the startIndex is the starting (minimum) index value at which the first valid data point is located. When the log header defines the direction as "Decreasing", the startIndex is the starting (maximum) index value at which the first valid data point is located. When the log header defines the direction as "Increasing", the endIndex is the ending (maximum) index value at which the last valid data point is located. When the log header defines the direction as Decreasing, the endIndex is the ending (minimum) index value at which the last valid data point is located. The sort order of the data row index values in the XML instance. For an "Increasing" direction the index value of consecutive data nodes are ascending. For a "Decreasing" direction the index value of consecutive data nodes are descending. The default direction is "Increasing". The direction of a log cannot be changed once it has been created. That is, this value cannot be updated in a server. The mnemonic of the index curve plus the column index. A column index of zero indicates an implied trace whose values start at startIndex and increment by stepIncrement for each row. An empty string is the default representation of a null value for a curve (i.e. when the null value representation is not explicitly defined). If a null value representation is defined for a log, this becomes the default for all curves in that log (but can be overridden at the curve level). An empty string is always a valid null value representation in the comma delimited list. An empty string is not a valid null value representation within a space delimited array. Specifying a null value also makes it easier to transform data back to a legacy format without having to scan the data to insure that the null pattern does not exist in the data. Log parameters. Container element for the log curve information. Container for one or more "rows" of log data.