<s>
KL-ONE	B-Language
(	O
pronounced	O
"	O
kay	O
ell	O
won	O
"	O
)	O
is	O
a	O
knowledge	O
representation	O
system	O
in	O
the	O
tradition	O
of	O
semantic	O
networks	O
and	O
frames	O
;	O
that	O
is	O
,	O
it	O
is	O
a	O
frame	O
language	O
.	O
</s>
<s>
There	O
is	O
a	O
whole	O
family	O
of	O
KL-ONE-like	O
systems	O
.	O
</s>
<s>
One	O
of	O
the	O
innovations	O
that	O
KL-ONE	B-Language
initiated	O
was	O
the	O
use	O
of	O
a	O
deductive	B-Algorithm
classifier	I-Algorithm
,	O
an	O
automated	O
reasoning	O
engine	O
that	O
can	O
validate	O
a	O
frame	O
ontology	B-Language
and	O
deduce	O
new	O
information	O
about	O
the	O
ontology	B-Language
based	O
on	O
the	O
initial	O
information	O
provided	O
by	O
a	O
domain	O
expert	O
.	O
</s>
<s>
Frames	O
in	O
KL-ONE	B-Language
are	O
called	O
concepts	O
.	O
</s>
<s>
These	O
form	O
hierarchies	O
using	O
subsume-relations	O
;	O
in	O
the	O
KL-ONE	B-Language
terminology	O
a	O
super	O
class	O
is	O
said	O
to	O
subsume	O
its	O
subclasses	O
.	O
</s>
<s>
Multiple	B-Application
inheritance	I-Application
is	O
allowed	O
.	O
</s>
<s>
In	O
KL-ONE	B-Language
descriptions	O
are	O
separated	O
into	O
two	O
basic	O
classes	O
of	O
concepts	O
:	O
primitive	O
and	O
defined	O
.	O
</s>
