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An operator used to assert that at least one of two (or more) parts of a concept definition or expression constraint must be true.
Disjunction can be represented by theOR operator. A disjunction of A with B , means that either A OR B must be true.
Disjunction gives the same result as an UNION between the set of concepts or expressions for which A is true and the set of concepts or expressions for which B is true.
The following expression constraint is satisfied by clinical findings that are subtypes of either 19829001 | Disorder of lung (disorder)| OR 301867009 | Edema of trunk (disorder)| .
< 19829001 |Disorder of lung| OR < 301867009 |Edema of trunk|
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