<s>
Loom	B-Language
is	O
a	O
knowledge	O
representation	O
language	O
developed	O
by	O
researchers	O
in	O
the	B-Application
artificial	I-Application
intelligence	I-Application
research	O
group	O
at	O
the	O
University	O
of	O
Southern	O
California	O
's	O
Information	O
Sciences	O
Institute	O
.	O
</s>
<s>
The	O
leader	O
of	O
the	O
Loom	B-Language
project	O
and	O
primary	O
architect	O
for	O
Loom	B-Language
was	O
Robert	O
MacGregor	O
.	O
</s>
<s>
Loom	B-Language
is	O
a	O
frame-based	O
language	O
in	O
the	O
tradition	O
of	O
KL-ONE	B-Language
.	O
</s>
<s>
As	O
with	O
KL-ONE	B-Language
,	O
Loom	B-Language
has	O
a	O
formal	O
semantics	O
that	O
maps	O
declarations	O
in	O
Loom	B-Language
to	O
statements	O
in	O
set	O
theory	O
and	O
First	O
Order	O
Logic	O
.	O
</s>
<s>
The	O
classifier	O
can	O
analyze	O
Loom	B-Language
models	O
(	O
known	O
as	O
ontologies	O
)	O
and	O
deduce	O
various	O
things	O
about	O
the	O
model	O
.	O
</s>
<s>
The	O
Loom	B-Language
project	O
's	O
goal	O
is	O
the	O
development	O
and	O
fielding	O
of	O
advanced	O
tools	O
for	O
knowledge	O
representation	O
and	O
reasoning	O
in	O
artificial	B-Application
intelligence	I-Application
.	I-Application
</s>
<s>
Loom	B-Language
is	O
a	O
language	O
and	O
environment	O
for	O
constructing	O
intelligent	O
applications	O
.	O
</s>
<s>
Declarative	O
knowledge	O
in	O
Loom	B-Language
consists	O
of	O
definitions	O
,	O
rules	O
,	O
facts	O
,	O
and	O
default	O
rules	O
.	O
</s>
<s>
A	O
deductive	O
engine	O
called	O
a	O
classifier	O
utilizes	O
forward	O
chaining	O
,	O
semantic	O
unification	O
,	O
and	O
object-oriented	B-Language
truth	O
maintenance	O
technologies	O
in	O
order	O
to	O
compile	O
the	O
declarative	O
knowledge	O
into	O
a	O
network	O
designed	O
to	O
efficiently	O
support	O
on-line	O
deductive	O
query	O
processing	O
.	O
</s>
<s>
The	O
Loom	B-Language
system	O
implements	O
a	O
logic-based	O
pattern	O
matcher	O
that	O
drives	O
a	O
production	O
rule	O
facility	O
and	O
a	O
pattern-directed	O
method	O
dispatching	O
facility	O
that	O
supports	O
the	O
definition	O
of	O
object-oriented	B-Language
methods	O
.	O
</s>
<s>
The	O
high	O
degree	O
of	O
integration	O
between	O
Loom	B-Language
's	O
declarative	O
and	O
procedural	O
components	O
permits	O
programmers	O
to	O
utilize	O
logic	O
programming	O
,	O
production	O
rule	O
,	O
and	O
object-oriented	B-Language
programming	I-Language
paradigms	O
in	O
a	O
single	O
application	O
.	O
</s>
<s>
Loom	B-Language
can	O
also	O
be	O
used	O
as	O
a	O
deductive	O
layer	O
that	O
overlays	O
an	O
ordinary	O
CLOS	B-Application
(	O
Common	B-Application
Lisp	I-Application
Object	I-Application
System	I-Application
)	O
network	O
.	O
</s>
<s>
In	O
this	O
mode	O
,	O
users	O
can	O
obtain	O
many	O
of	O
the	O
benefits	O
of	O
using	O
Loom	B-Language
without	O
impacting	O
the	O
function	O
or	O
performance	O
of	O
their	O
CLOS-based	O
applications	O
.	O
</s>
<s>
Loom	B-Language
has	O
recently	O
been	O
succeeded	O
by	O
PowerLoom	B-Language
.	O
</s>
