code: def validate_document(self, definition):
          
          initial_document = {}
          try:
              initial_document = Loader.load(definition)
          except RuntimeError as exception:
              self.logger.error(str(exception))
              sys.exit(1)
  
          document = Validator().validate(initial_document)
          if document is None:
              self.logger.info("Schema validation for '%s' has failed", definition)
              sys.exit(1)
          self.logger.info("Schema validation for '%s' succeeded", definition)
          return document
docs: Validate given pipeline document.
  
          The method is trying to load, parse and validate the spline document.
          The validator verifies the Python structure B{not} the file format.
  
          Args:
              definition (str): path and filename of a yaml file containing a valid spline definition.
  
          Returns:
              dict: loaded and validated spline document.
  
          Note:
              if validation fails the application does exit!
  
          See Also:
              spline.validation.Validator