Existing Wording: 4.20.4.2 Constraints (observation.html#4.20.4.2)

obs-3: On Observation.referenceRange: Must have at least a low or a high or text (xpath on f:Observation/f:referenceRange:

(exists(f:low) or exists(f:high)or exists(f:text)))

obs-4: On Observation.referenceRange.low: Low range comparators can only be '>' or '>=' or empty (xpath on

f:Observation/f:referenceRange/f:low: not(exists(f:comparator)) or boolean(f:comparator/@value = '<') or

boolean(f:comparator/@value = '<='))

obs-5: On Observation.referenceRange.high: High range comparators can only be '<' or '<=' or empty (xpath on

f:Observation/f:referenceRange/f:high: not(exists(f:comparator)) or boolean(f:comparator/@value = '>') or

boolean(f:comparator/@value = '>='))

obs-6: Shall only be present if Observation.value[x] is not present (xpath: not(exists(f:dataAbsentReason)) or

(not(exists(*[starts-with(local-name(.), 'value')]))))

Comment:

but reference ranges are almost always specified as X1-X2 -this seems to demand a new syntax.