<s>
Interleaved	B-Protocol
deltas	I-Protocol
,	O
or	O
SCCS	O
weave	O
is	O
a	O
method	O
used	O
by	O
the	O
Source	B-Device
Code	I-Device
Control	I-Device
System	I-Device
to	O
store	O
all	O
revisions	O
of	O
a	O
file	O
.	O
</s>
<s>
Interleaved	B-Protocol
deltas	I-Protocol
are	O
traditionally	O
implemented	O
with	O
line	O
oriented	O
text	O
files	O
in	O
mind	O
,	O
although	O
nothing	O
prevents	O
the	O
method	O
from	O
being	O
applied	O
to	O
binary	O
files	O
as	O
well	O
.	O
</s>
<s>
Interleaved	B-Protocol
deltas	I-Protocol
were	O
first	O
implemented	O
by	O
Marc	O
Rochkind	O
in	O
the	O
SCCS	O
in	O
1975	O
.	O
</s>
<s>
The	O
term	O
interleaved	O
delta	O
was	O
coined	O
later	O
in	O
1982	O
by	O
Walter	O
F	O
.	O
Tichy	O
,	O
author	O
of	O
the	O
Revision	B-Architecture
Control	I-Architecture
System	I-Architecture
,	O
which	O
compares	O
the	O
SCCS	O
weave	O
to	O
his	O
new	O
reverse	O
delta	O
mechanism	O
in	O
RCS	O
.	O
</s>
<s>
In	O
order	O
to	O
extract	O
a	O
specific	O
revision	O
,	O
an	O
array	O
of	O
structures	O
needs	O
to	O
be	O
constructed	O
,	O
telling	O
whether	O
a	O
specific	O
block	O
,	O
tagged	O
by	O
a	O
serial	O
number	O
in	O
the	O
interleaved	B-Protocol
deltas	I-Protocol
,	O
will	O
be	O
copied	O
to	O
the	O
output	O
or	O
not	O
.	O
</s>
<s>
Bazaar	B-Protocol
intended	O
to	O
use	O
interleaved	B-Protocol
deltas	I-Protocol
in	O
2006	O
,	O
but	O
it	O
was	O
ditched	O
due	O
to	O
poor	O
performance	O
after	O
it	O
was	O
actually	O
implemented	O
in	O
bzr	B-Protocol
0.1	O
.	O
</s>
