<s>
OIL	O
(	O
Ontology	B-Language
Inference	I-Language
Layer	I-Language
or	O
Ontology	O
Interchange	O
Language	O
)	O
can	O
be	O
regarded	O
as	O
an	O
ontology	O
infrastructure	O
for	O
the	O
Semantic	O
Web	O
.	O
</s>
<s>
OIL	O
is	O
based	O
on	O
concepts	O
developed	O
in	O
Description	B-Language
Logic	I-Language
(	O
DL	O
)	O
and	O
frame-based	O
systems	O
and	O
is	O
compatible	O
with	O
RDFS	O
.	O
</s>
<s>
Much	O
of	O
the	O
work	O
in	O
OIL	O
was	O
subsequently	O
incorporated	O
into	O
DAML+OIL	O
and	O
the	O
Web	B-Language
Ontology	I-Language
Language	I-Language
(	O
OWL	B-Language
)	O
.	O
</s>
