Name	Flags	Card.	Type	Description & Constraints
Quantity	Σ I N		Element	A measured or measurable amount + Rule: If a code for the unit is present, the system SHALL also be present Elements defined in Ancestors: id, extension
value	Σ	0..1	decimal	Numerical value (with implicit precision)
comparator	?! Σ	0..1	code	< | <= | >= | > - how to understand the value QuantityComparator ( Required)
unit	Σ	0..1	string	Unit representation
system	Σ I	0..1	uri	System that defines coded unit form
code	Σ	0..1	code	Coded form of the unit
Documentation for this format