WITSML - Realtime Channel Component Schema Used to differentiate between multiples of same sensor type. The mnemonic must be unique within the context of each group definition. Specifies the data encoding of a "value". If this value is not supplied, the data type is assumed to be double. Name of channel from realtime catalog. Although this is optional, it is strongly recommended that it be included. This defines the underlying meaning of the curve (e.g., a porosity). Mnemonic allows multiple channels of the same class to exist in one realtime. A 1-based index of curve data in the data records. This can only be specified if multiplexed is true in the group definition. The unit of measure for a quantity value. This can only be specified if multiplexed is true in the group definition. For demultiplexed values the unit is carried by each individual value. A description of the channel. Name alias for this trace. Offset of sensor from a downhole equipment vertical reference (the drill bit, for MWD logs; the tool zero reference for wireline logs). This element is only informative (log values are presented at actual depth, not requiring subtraction of an offset). Data source, could be tool name/id. A container element that describes how data was gathered, computed, and sampled. This can only be specified if multiplexed is false in the group definition. That is, this can only be specified for a de-multiplexed representation. Indicates that the channel is an array channel (i.e., multi-valued samples), and provides meta data by which an axis of the array can be understood.