f:Observation text: minimum cardinality of 'text' is 1 subject: minimum cardinality of 'subject' is 1 effective[x]: minimum cardinality of 'effective[x]' is 1 performer: minimum cardinality of 'performer' is 1 performer: maximum cardinality of 'performer' is 1 value[x]: minimum cardinality of 'value[x]' is 1 f:Observation/f:identifier id: maximum cardinality of 'id' is 1 use: maximum cardinality of 'use' is 1 type: maximum cardinality of 'type' is 1 system: minimum cardinality of 'system' is 1 system: maximum cardinality of 'system' is 1 value: minimum cardinality of 'value' is 1 value: maximum cardinality of 'value' is 1 period: maximum cardinality of 'period' is 1 assigner: maximum cardinality of 'assigner' is 1 f:Observation/f:code id: maximum cardinality of 'id' is 1 text: maximum cardinality of 'text' is 1