docs: def from_json(self, document):
          """Create a model database object from a given Json document.
  
          Parameters
          ----------
          document : JSON
              Json representation of the object
  
          Returns
          ModelHandle
          """
          # The timestamp is optional (e.g., in cases where model definitions are
          # loaded from file).
          if 'timestamp' in document:
              timestamp = datetime.datetime.strptime(
                  document['timestamp'],
                  '%Y-%m-%dT%H:%M:%S.%f'
              )
          else:
              timestamp = None
          # Create handle for database object
          return ModelHandle(
              document['_id'],
              document['properties'],
              [AttributeDefinition.from_json(el) for el in document['parameters']],
              ModelOutputs.from_json(document['outputs']),
              timestamp=timestamp
          )