The non-contextual content of a WITSML Realtime object. Realtime data is not persistent data. At least one of dTim and md must be given. The time index for the realtime object if the interval type is time-based. It is the default time index for all data in the realtime object. Both dTim and md can be overridden at the channel level. This value should be given when "dTim" is given with any channel. Along hole measured depth of measurement from the drill datum. It is the default depth index for all data in the realtime object. Both dTim and md can be overridden at the channel level. This value should be given when "md" is given with any channel. The one-based sequence of realtime messages for one subscription. The first message for a subscription should have a sequence number of one and each subsequent message for that subscription should increment by one. A code used to define rig activity. Custom string to further define an activity. The group name of the channels in this realtime. For example, a publisher can publish data from the mudlogger, drilling and MWD systems at the same time. The drilling and mudlogger systems could have channels with the same mnemonic. The group name is used to distinguish between curves from these different source systems. At least one of realtimeHeader and channel must be given. A channel must always be given unless only the header is being returned because a retransmit was requested or because the header was updated. The information which is constant for all realtimes. This will only be sent with the first realtime for a subscription, when a retransmit is requested or when the header is updated (e.g., when more channels are added). The data associated with a (de-multiplexed) channel. The multiplexed data associated with a channel.