constructor Create(Owner: TDBISAMIndexDefs; const Name: String;
      const Fields: String; Options: TIndexOptions=[]; const
      DescFields: String=''; Compression: TIndexCompression=icNone;
      NoKeyStats: Boolean=False)

Call the Create constructor to create an instance of a TDBISAMIndexDef object. However, you should never need to create an instance of the TDBISAMIndexDef object since one is automatically created when using the various methods of the TDBISAMIndexDefs object.