code: def ot_validate(nexson, **kwargs):
      
      # stub function for hooking into NexSON validation
      codes_to_skip = [NexsonWarningCodes.UNVALIDATED_ANNOTATION]  # pylint: disable=E1101
      v_log, adaptor = validate_nexson(nexson, codes_to_skip, **kwargs)
      annotation = v_log.prepare_annotation(author_name='api.opentreeoflife.org/validate',
                                            description='Open Tree NexSON validation')
      return annotation, v_log, adaptor
docs: Returns three objects:
          an annotation dict (NexSON formmatted),
          the validation_log object created when NexSON validation was performed, and
          the object of class NexSON which was created from nexson. This object may
              alias parts of the nexson dict that is passed in as an argument.
  
      Currently the only kwargs used is 'max_num_trees_per_study'