f:Procedure code: minimum cardinality of 'code' is 1 performer: minimum cardinality of 'performer' is 1 performer: maximum cardinality of 'performer' is 1 f:Procedure/f:subject id: maximum cardinality of 'id' is 1 reference: maximum cardinality of 'reference' is 1 type: maximum cardinality of 'type' is 1 identifier: maximum cardinality of 'identifier' is 1 display: maximum cardinality of 'display' is 1