19 - 'schema:dateCreated'
21 callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
24 - 'schema:dateModified'
26 callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
39 - 'schema:interactionCount'
41 callable: 'Drupal\rdf\SchemaOrgDataConverter::interactionCount'
43 interaction_type: UserComments