WITSML Log - Curve Information The curve name. This must be unique for all curves in a log. The curve classification obtained from a lookup in the vendors mnemonic catalog. Unit of measurement of the data values. Name alias for this trace. 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 is defined in the logCurveInfo, it overrides any null value specified at the logHeader 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. True (true or 1) if this curve is a candidate to be a primary index. False (false or 0) or not given, indicates otherwise. An index curve should monotonically change when sorted on its own values (i.e., no duplicates). A pointer to the wellDatum that represents the values of this trace. This is only relevant for measured depths, vertical depths or elevations. The minimum index value at which the first valid data point is located. This value will be properly set by the server to reflect data in the returned document. The maximum index value at which the last valid data point is located. This value will be properly set by the server to reflect data in the returned document. The minimum index value at which the first valid data point is located. This value will be properly set by the server to reflect data in the returned document. The maximum index value at which the last valid data point is located. This value will be properly set by the server to reflect data in the returned document. A 1-based index of data in the LOGDATA.DATA section. A value of zero indicates an implied curve with no values in the data record. Description of the curve. Offset of sensor from drill bit. This element is only informative. The measured depth values are at the actual depth (not bit depth from which you must subtract the offset). Data source, could be tool name/id. Data density of sample in samples per length unit. State of trace data. Origin of trace data. Log data type. Indicates that the curve is an array curve (i.e., multi-valued samples), and provides meta data by which an axis of the array can be understood. Unique identifier for the curve information.