<s>
XCOFF	B-Operating_System
,	O
for	O
"	O
eXtended	O
COFF	O
"	O
,	O
defined	O
by	O
IBM	O
and	O
used	O
in	O
AIX	B-Application
,	O
is	O
an	O
improved	O
and	O
expanded	O
version	O
of	O
the	O
COFF	O
object	B-Application
file	I-Application
format	I-Application
.	O
</s>
<s>
Early	O
versions	O
of	O
the	O
PowerPC	B-Architecture
Macintosh	B-Device
also	O
supported	O
XCOFF	B-Operating_System
,	O
as	O
did	O
BeOS	B-Application
.	O
</s>
<s>
XCOFF	B-Operating_System
additions	O
include	O
the	O
use	O
of	O
CSECTs	O
to	O
provide	O
subsection	O
granularity	O
of	O
cross-references	O
,	O
and	O
the	O
use	O
of	O
stabs	B-General_Concept
for	O
debugging	O
.	O
</s>
<s>
More	O
recently	O
,	O
IBM	O
defined	O
an	O
XCOFF64	O
version	O
supporting	O
64-bit	B-Device
AIX	B-Application
,	O
and	O
used	O
XCOFF32	O
to	O
mean	O
the	O
original	O
file	O
format	O
.	O
</s>
