Measurement uncertainty

[kruzikh]

@gcangioli Should we explicitly add extension for uncertainty of measurement to the Quantity data type?

http://hl7.org/fhir/StructureDefinition/iso21090-uncertainty

[gcangioli]

@kruzikh I'd say yes as optional extension.

[gcangioli]

@kruzikh only quantity may have uncertainty or also other kinds of measures (e.g. ratio, range,....) may ?

[kruzikh]

@gcangioli, you are right, uncertainty of measurement can be used also for other types of quantity. I will prepare a new commit.