f:Observation/f:category id: maximum cardinality of 'id' is 1 text: maximum cardinality of 'text' is 1 f:Observation/f:category/f:coding id: maximum cardinality of 'id' is 1 system: maximum cardinality of 'system' is 1 version: maximum cardinality of 'version' is 1 code: maximum cardinality of 'code' is 1 display: maximum cardinality of 'display' is 1 userSelected: maximum cardinality of 'userSelected' is 1 f:Observation/f:category/f:coding/f:display id: maximum cardinality of 'id' is 1 value: maximum cardinality of 'value' is 1