f:DocumentReference version: minimum cardinality of 'version' is 1 subject: minimum cardinality of 'subject' is 1 date: minimum cardinality of 'date' is 1 author: maximum cardinality of 'author' is 1 f:DocumentReference/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:DocumentReference/f:content/f:attachment id: maximum cardinality of 'id' is 1 contentType: maximum cardinality of 'contentType' is 1 language: maximum cardinality of 'language' is 1 data: maximum cardinality of 'data' is 1 url: maximum cardinality of 'url' is 1 size: maximum cardinality of 'size' is 1 hash: maximum cardinality of 'hash' is 1 title: maximum cardinality of 'title' is 1 creation: maximum cardinality of 'creation' is 1 height: maximum cardinality of 'height' is 1 width: maximum cardinality of 'width' is 1 frames: maximum cardinality of 'frames' is 1 duration: maximum cardinality of 'duration' is 1 pages: maximum cardinality of 'pages' is 1