code: def get_rml(self, rml_def, **kwargs):
          
          if isinstance(rml_def, str):
              rml_procs = self.es_defs.get("kds_esRmlProcessor", [])
              for item in rml_procs:
                  if item['name'] == rml_def:
                      rml_def = item
                      break
          proc_kwargs = {rml_def['subj']: self.subject,
                         "dataset": self.dataset}
          proc_kwargs.update(rml_def['proc_kwargs'])
          return rml_def['processor'](**proc_kwargs)
docs: returns the rml mapping output for specified mapping
  
          Args:
          -----
              rml_def: The name of the mapping or a dictionary definition