<s>
nl	B-Application
is	O
a	O
file	O
format	O
for	O
presenting	O
and	O
archiving	O
mathematical	O
programming	O
problems	O
.	O
</s>
<s>
Initially	O
,	O
this	O
format	O
has	O
been	O
invented	O
for	O
connecting	O
solvers	O
to	O
AMPL	B-Language
.	O
</s>
<s>
It	O
has	O
also	O
been	O
adopted	O
by	O
other	O
systems	O
such	O
as	O
COIN-OR	B-Application
(	O
as	O
one	O
of	O
the	O
input	O
formats	O
)	O
,	O
FortSP	B-Application
(	O
for	O
interacting	O
with	O
external	O
solvers	O
)	O
,	O
and	O
Coopr	B-Application
(	O
as	O
one	O
of	O
its	O
output	O
formats	O
)	O
.	O
</s>
<s>
The	O
nl	B-Application
format	O
supports	O
a	O
wide	O
range	O
of	O
problem	O
types	O
,	O
among	O
them	O
:	O
</s>
<s>
The	O
nl	B-Application
format	O
is	O
low-level	O
and	O
is	O
designed	O
for	O
compactness	O
,	O
not	O
for	O
readability	O
.	O
</s>
<s>
The	O
open-source	O
AMPL	B-Language
Solver	O
Library	O
distributed	O
via	O
Netlib	B-Application
and	O
AMPL/MP	O
library	O
provide	O
nl	B-Application
parsers	B-Language
that	O
are	O
used	O
in	O
many	O
solvers	O
.	O
</s>
