<s>
Knowledge	B-Language
Interchange	I-Language
Format	I-Language
(	O
KIF	O
)	O
is	O
a	O
computer	B-Language
language	I-Language
designed	O
to	O
enable	O
systems	O
to	O
share	O
and	O
re-use	O
information	O
from	O
knowledge-based	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
KIF	O
is	O
similar	O
to	O
frame	O
languages	O
such	O
as	O
KL-One	B-Language
and	O
LOOM	B-Language
but	O
unlike	O
such	O
language	O
its	O
primary	O
role	O
is	O
not	O
intended	O
as	O
a	O
framework	O
for	O
the	O
expression	O
or	O
use	O
of	O
knowledge	O
but	O
rather	O
for	O
the	O
interchange	O
of	O
knowledge	O
between	O
systems	O
.	O
</s>
<s>
The	O
designers	O
of	O
KIF	O
likened	O
it	O
to	O
PostScript	B-Language
.	O
</s>
<s>
PostScript	B-Language
was	O
not	O
designed	O
primarily	O
as	O
a	O
language	O
to	O
store	O
and	O
manipulate	O
documents	O
but	O
rather	O
as	O
an	O
interchange	O
format	O
for	O
systems	O
and	O
devices	O
to	O
share	O
documents	O
.	O
</s>
<s>
It	O
is	O
a	O
formal	O
language	O
,	O
i.e.	O
,	O
it	O
can	O
express	O
arbitrary	O
statements	O
in	O
first	O
order	O
logic	O
and	O
can	O
support	O
reasoners	B-Application
that	O
can	O
prove	O
the	O
consistency	O
of	O
a	O
set	O
of	O
KIF	O
statements	O
.	O
</s>
<s>
A	O
later	O
version	O
called	O
Common	B-Language
Logic	I-Language
has	O
since	O
been	O
developed	O
for	O
submission	O
to	O
ISO	O
and	O
has	O
been	O
approved	O
and	O
published	O
.	O
</s>
<s>
A	O
variant	O
called	O
SUO-KIF	B-Language
is	O
the	O
language	O
in	O
which	O
the	O
Suggested	B-Language
Upper	I-Language
Merged	I-Language
Ontology	I-Language
is	O
written	O
.	O
</s>
<s>
A	O
practical	O
application	O
of	O
the	O
Knowledge	B-Language
interchange	I-Language
format	I-Language
is	O
an	O
agent	O
communication	O
language	O
in	O
a	O
multi-agent	O
system	O
.	O
</s>
