19 - 'schema:dateCreated'
21 callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
24 - 'schema:dateModified'
26 callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
36 - 'schema:interactionCount'
38 callable: 'Drupal\rdf\SchemaOrgDataConverter::interactionCount'
40 interaction_type: UserComments