code: def load_query_string_data(request_schema, query_string_data=None):
      
      if query_string_data is None:
          query_string_data = request.args
  
      request_data = request_schema.load(query_string_data)
      if request_data.errors:
          # pass the validation errors back in the context
          raise with_context(UnprocessableEntity("Validation error"), dict(errors=request_data.errors))
      return request_data.data
docs: Load query string data using the given schema.
  
      Schemas are assumed to be compatible with the `PageSchema`.