Duration | Duration | Used to specify a time period or interval in the form "number of years, number of months, number of days, number of hours, number of minutes, and number of seconds, preceded by a "P" (PnYnMnDTnHnMnS). The letter "T" indicates the start of the time section. For example, P5Y2M10DT15H stands for a period of five years, two months, 10 days, and 15 hours. A period preceded by the minus sign ("-") will indicate a negative duration, for example, -P10D stands for a period of minus 10 days.
Duration should be added as option:
Duration | Duration | Used to specify a time period or interval in the form "number of years, number of months, number of days, number of hours, number of minutes, and number of seconds, preceded by a "P" (PnYnMnDTnHnMnS). The letter "T" indicates the start of the time section. For example, P5Y2M10DT15H stands for a period of five years, two months, 10 days, and 15 hours. A period preceded by the minus sign ("-") will indicate a negative duration, for example, -P10D stands for a period of minus 10 days.
DDI CV terms and definitions should be added: http://www.ddialliance.org/Specification/DDI-CV/DateType_1.1.html