{ storage_clause
| PCTVERSION integer
| { CACHE 
  | { NOCACHE | CACHE READS } [ LOGGING | NOLOGGING ]
  }
| { allocate_extent_clause 
  | deallocate_unused_clause
  }
}
[ storage_clause
| PCTVERSION integer
| { CACHE 
  | { NOCACHE | CACHE READS } [ LOGGING | NOLOGGING ]
  }
| { allocate_extent_clause 
  | deallocate_unused_clause
  }
]...

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.