Hi The advantage of duration is that time can be expressed in the usual way 2 months, 6 weeks, 2hr 30min, 5min 30sec etc.
The Quantity has the advantage of being able to set a fixed unit. This is necessary sometimes and although this can be done with duration it is not really the focus. I think both have a role. Cheers, Sam > -----Original Message----- > From: openehr-technical-bounces at openehr.org [mailto:openehr-technical- > bounces at openehr.org] On Behalf Of Ian McNicoll > Sent: Friday, 17 December 2010 11:26 PM > To: For openEHR technical discussions > Subject: Re: DV_QUANTITY or DV_DURATION? > > Hi Thomas, > > I think I have used DV+DURATION in all of these circumstances.. My > impression has been that DV_QUANTITY with time property was > deprecated. > > Ian > > Dr Ian McNicoll > office / fax? +44(0)1536 414994 > mobile +44 (0)775 209 7859 > skype ianmcnicoll > ian.mcnicoll at oceaninformatics.com > > > Clinical analyst,?Ocean Informatics > openEHR Clinical Knowledge Editor www.openehr.org/knowledge > Honorary Senior Research Associate, CHIME, UCL > BCS Primary Health Care SG Group www.phcsg.org > > > > > On 17 December 2010 13:48, Thomas Beale > <thomas.beale at oceaninformatics.com> wrote: > > > > The most usual uses are: > > > > DV_DURATION - time periods in the 'social' timescale, e.g. hours, > days, > > weeks, months, years - e.g. pregnancy, Expected Date of Delivery, > duration > > of migraine > > DV_QUANTITY - short time periods, being treated more mathematically, > e.g. > > seconds or smaller, minutes and hours > > > > both can be used for computation and can be inter-converted. > > > > - thomas > > > > On 17/12/2010 13:22, Leonardo Moretti wrote: > > > > I'm wondering which is the correct use of DV_DURATION and > DV_QUANTITY... > > When using DV_QUANTITY with property attribute 'time' (openehr::128) > and > > when using DV_DURATION? > > > > Regards > > leo > > > > > > _______________________________________________ > > openEHR-technical mailing list > > openEHR-technical at openehr.org > > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > > > > > > _______________________________________________ > openEHR-technical mailing list > openEHR-technical at openehr.org > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical
