f:ServiceRequest code: minimum cardinality of 'code' is 1 f:ServiceRequest/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 f:ServiceRequest/f:occurrence[x] 1 repeat: minimum cardinality of 'repeat' is 1 f:ServiceRequest/f:occurrence[x]/f:repeat 1 frequency: minimum cardinality of 'frequency' is 1 period: minimum cardinality of 'period' is 1 periodUnit: minimum cardinality of 'periodUnit' is 1