code: def custom_observable_object_prefix_lax(instance):
      
      for key, obj in instance['objects'].items():
          if ('type' in obj and obj['type'] not in enums.OBSERVABLE_TYPES and
                  obj['type'] not in enums.OBSERVABLE_RESERVED_OBJECTS and
                  not CUSTOM_TYPE_LAX_PREFIX_RE.match(obj['type'])):
              yield JSONError("Custom Observable Object type '%s' should start "
                              "with 'x-'."
                              % obj['type'], instance['id'],
                              'custom-prefix-lax')
docs: Ensure custom observable objects follow naming style conventions.