code: @PostMapping("/tagattribute")
    public @ResponseBody OntologyTag addTagAttribute(@Valid @RequestBody AddTagRequest request) {
      return ontologyTagService.addAttributeTag(
          request.getEntityTypeId(),
          request.getAttributeName(),
          request.getRelationIRI(),
          request.getOntologyTermIRIs());
    }
docs: Add a tag for a single attribute
  
  @param request the {@link AddTagRequest} containing the entityTypeId, attributeName,
  relationIRI and ontologyTermIRIs