@SEC - there is maybe a related use case with pregnancy, where we need to describe a due date as a Duration data type expressed in weeks but with a variation of x days eg 34 weeks +/- 7 days.

I’m wondering if there is a need to add an attribute to the Duration and Count data types that allows us to express the variation - Silje’s example of ‘87+1’ or ‘88-3’ or the pregnancy 34 **wks** +/- 7 **days**. So we need 3 components to express the pregnancy date and most of the genomics example:

- the data value;
- a modifier(?) of OR OR
**/** - the variance(?).

In Silje’s example there is also a need to add another qualifier, an

Otherwise we need 3 separate data elements for each time we need to represent this pattern, if we use current modelling practice, which is rather inelegant. In the genomics example we need multiple groupings of 3 which would probably need to be grouped into an internal/standalone CLUSTER and some archetypes will need multiple groups of 3, plus the asterisk indicating another attribute in the genomic represenation. I foresee some modelling chaos happening here if we ‘fudge’ it this way.