WITSML - Realtime Channel Component Schema The id of the group that this channel represents. The mnemonic assigned to the channel. This must match a mnemonic of a channel definition in the header and represents the unique key of the channel. Multiple (de-multiplexed) channels with the same mnemonic cannot exist in the same realtime. The time index for the realtime channel if the interval type is time-based. Along hole measured depth of measurement from the drill datum. Value of the channel. The encoding of the value is defined by "dataType" in the header. For array channels, this will be a space delimited list of values. Data density of sample in samples per length unit Data quality indicator. Formation exposure time.