For each system service defined, a corresponding ECL function prototype must be declared (see SERVICE Structure).

  servicename := SERVICE
    functionname(parameter list) [: keyword = value];
    END;
  
  For example:
  email := SERVICE
    simpleSend(STRING address, STRING template, STRING subject)
       : LIBRARY='ecl2cw', INITFUNCTION='initEcl2Cw';
     END;