code: def check(self, radl):
          
  
          if not radl.get_system_by_name(self.id):
              raise RADLParseException("Invalid system id in the deploy.", line=self.line)
  
          if self.vm_number < 0:
              raise RADLParseException("Invalid number of virtual machines to deploy.",
                                       line=self.line)
docs: Check this deploy.