On 20/03/2018 23:33, A Verhees wrote:
One last remark.
There is in medical context need of a datatypes to express: "do this
one time a month, for example on a specific date".
But technically seen, this is not a duration, the maybe a need for
another datatype to express this.
Using the duration for this may be a handy shortcut in specs, but it
is not right. It is in fact misusing a datatype which does not support
this expression. The ISO string should also be changed accordingly.
we don't really use Duration to represent 3 times / day. There are old
HL7 data types which we included in openEHR to do this, called GTS and
its children
<http://www.openehr.org/releases/RM/latest/docs/data_types/data_types.html#_time_specification_package>.
It seems that noone uses these. THere have been many other attempts to
define either types or structures, like iCal and other calendar-related
structures. But I don't see a clear winner in terms of standards.
THe medication archetypes solve it by using multiple fields, and in Task
Planning we had to create some new time specification types as well -
CLOCK_TIME, CALENDAR_TIME, and CUSTOMARY_TIME
<http://www.openehr.org/releases/PROC/latest/docs/task_planning/task_planning.html#_specifying_time>.
- thomas
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