offsetRelativeQualifier
A qualifier that extends a quantity offset in a before/after interval operator phrase to include the boundary. or more means at least the given offset; or less means at most the given offset.
Examples
At least 30 days before
MedStart 30 days or more before start of Encounter.period
At most 7 days after
MedStart 7 days or less after end of Encounter.period
EBNF
offsetRelativeQualifier : 'or more' | 'or less' ;