The non-contextual content of a WITSML Classified Interval object. The starting measured depth of the interval. While the measured depths and vertical depths are optonal, at least one set must be given in order to define the interval. While the measured depths and vertical depths are optonal, at least one set must be given in order to define the interval. The ending measured depth of the interval. The starting true vertical depth of the interval. The ending true vertical depth of the interval. The date and time associated with this interval The pressure in the interval. A classification of the interval. A comment about the Interval.