1 ENTRY 2? ( 2.1+ , 2.1 %parameter-descr 2.1 %structure-union-descr 2.2 ) parameter-descr: 1+ 1 attribute 1 * 1.1.0? 1.1.0 ALIGNED 1.1.0 UNALIGNED 1.1? 1.1ASSIGNABLE 1.1NONASSIGNABLE 1.1? 1.1 CONNECTED 1.1NONCONNECTED 1.1!BYADDR 1.1? 1.1?BYVALUE 1.2?OPTIONAL structure-union-descr: 1 1 2+ 2? attribute 3? OPTIONAL 4 , 5+ 5 level 5.1? attribute