Name	Flags	Card.	Type	Description & Constraints
Distance	Σ TU		Quantity	A length - a value with a unit that is a physical distance Binding: Common UCUM Codes for Distance ( Extensible) Additional Bindings Purpose All UCUM Expression for Distance Max Binding + Rule: There SHALL be a code if there is a value and it SHALL be an expression of length. If system is present, it SHALL be UCUM. Elements defined in Ancestors: id, extension, value, comparator, unit, system, code
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