<s>
Protégé	B-Language
is	O
a	O
free	O
,	O
open	O
source	O
ontology	O
editor	O
and	O
a	O
knowledge	O
management	O
system	O
.	O
</s>
<s>
The	O
Protégé	B-Language
meta-tool	O
was	O
first	O
built	O
by	O
Mark	O
Musen	O
in	O
1987	O
and	O
has	O
since	O
been	O
developed	O
by	O
a	O
team	O
at	O
Stanford	O
University	O
.	O
</s>
<s>
Protégé	B-Language
provides	O
a	O
graphic	O
user	O
interface	O
to	O
define	O
ontologies	O
.	O
</s>
<s>
It	O
also	O
includes	O
deductive	B-Algorithm
classifiers	I-Algorithm
to	O
validate	O
that	O
models	O
are	O
consistent	O
and	O
to	O
infer	O
new	O
information	O
based	O
on	O
the	O
analysis	O
of	O
an	O
ontology	O
.	O
</s>
<s>
Like	O
Eclipse	B-Application
,	O
Protégé	B-Language
is	O
a	O
framework	O
for	O
which	O
various	O
other	O
projects	O
suggest	O
plugins	O
.	O
</s>
<s>
This	O
application	O
is	O
written	O
in	O
Java	B-Language
and	O
makes	O
heavy	O
use	O
of	O
Swing	B-Language
to	O
create	O
the	O
user	O
interface	O
.	O
</s>
<s>
Protégé	B-Language
is	O
developed	O
at	O
Stanford	O
University	O
and	O
is	O
made	O
available	O
under	O
the	O
BSD	O
2-clause	O
license	O
.	O
</s>
