The following applies:
The version identifier must be X'FF03' or higher.
The indicator (bit) for identifying catalog entries with large objects (large extent list) identifies whether the format used is 3-byte or 4-byte.
The description of the extent list for large objects uses 4-byte format; an extent list that does not belong to large objects remains in 3-byte format, under another name. An additional substructure exists for the extent list (DCAEE4 or DCAEE4I), where the fields for the LHP and the PHP are each 4 bytes in length. The old substructure for the old extent list form (IDEE or DCMIDEET) with 3-byte fields has been retained.
An additional 4-byte field exists for the file size in the main part of the catalog entry, although the old 3-byte field has been retained (under another name) in the old part.
The maximum size for extent lists has been extended to 2496 bytes. For large files, the maximum size for extent lists has been extended to 2496 bytes. A large file, like a small file, can thus contain a maximum of 310 extents.
An additional 4-byte field exists for the last halfpage pointer in the main part of the catalog entry, although the old 3-byte field has been retained (under another name) in the old part.