<s>
sol	B-Application
is	O
a	O
file	O
format	O
for	O
representing	O
solutions	O
of	O
mathematical	O
programming	O
problems	O
.	O
</s>
<s>
It	O
is	O
often	O
used	O
in	O
conjunction	O
with	O
the	O
nl	B-Application
format	I-Application
to	O
return	O
solutions	O
from	O
the	O
solvers	O
.	O
</s>
<s>
Initially	O
this	O
format	O
has	O
been	O
invented	O
for	O
connecting	O
solvers	O
to	O
AMPL	B-Language
but	O
then	O
it	O
has	O
been	O
adopted	O
by	O
other	O
systems	O
such	O
as	O
FortSP	B-Application
for	O
interacting	O
with	O
external	O
solvers	O
.	O
</s>
<s>
The	O
sol	B-Application
format	O
is	O
low-level	O
and	O
is	O
designed	O
for	O
compactness	O
not	O
for	O
readability	O
.	O
</s>
<s>
Many	O
solvers	O
such	O
as	O
CPLEX	B-Application
and	O
MOSEK	B-Application
can	O
produce	O
files	O
in	O
this	O
format	O
either	O
directly	O
or	O
through	O
special	O
driver	O
programs	O
.	O
</s>
<s>
The	O
AMPL	B-Language
Solver	O
Library	O
(	O
ASL	O
)	O
which	O
allows	O
among	O
other	O
things	O
to	O
read	O
and	O
write	O
the	O
sol	B-Application
files	O
is	O
open-source	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
many	O
solvers	O
to	O
implement	O
AMPL	B-Language
connection	O
.	O
</s>
