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Jack, The kilogram is in the base-units database because the kilogram is the base unit of mass in the SI unit system, which is the default unit system of the UDUNITS package. The names "second" and "sec" are not in the base-units database because that database was not designed to hold names, only symbols. I see no need to revisit these decisions. > I am wondering if you are considering the following changes ... > > 1) making kg a derivative of g instead of vice versa as it is currently ( > g is in udunits2-derived.xml and kg in udunits2-base.xml ) > 2) including "sec" and an alias of second in udunits2-base.xml instead of > locating it in udunits2-common.xml > > or explain the rationale for the current assignments. Regards, Steve Emmerson Ticket Details =================== Ticket ID: PIK-524714 Department: Support UDUNITS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.