anchor.diff:      ;
   
   undo_tablespace_clause
  -    : UNDO TABLESPACE tablespace_name=REGULAR_ID
  +    : UNDO TABLESPACE tablespace_name=id_expression
           datafile_specification? 
           extent_management_clause? tablespace_retention_clause?
       ;
  
positive.code:     ;
  
  temporary_tablespace_clause
      : TEMPORARY TABLESPACE tablespace_name=REGULAR_ID
          tempfile_specification?
          tablespace_group_clause? extent_management_clause?
      ;
  
negative.code: 
  segment_attributes_clause
      : ( physical_attributes_clause
        | TABLESPACE tablespace_name=id_expression
        | logging_clause
        )+
      ;
  