<s>
Claire	B-Language
is	O
a	O
high-level	O
functional	B-Language
and	O
object-oriented	B-Language
programming	I-Language
language	I-Language
with	O
rule	B-Application
processing	I-Application
abilities	O
.	O
</s>
<s>
Claire	B-Language
provides	O
:	O
</s>
<s>
Claire	B-Language
's	O
reference	O
implementation	O
,	O
consisting	O
of	O
an	O
interpreter	O
and	O
compiler	O
,	O
was	O
fully	O
open-sourced	O
with	O
the	O
release	O
of	O
version	O
3.3.46	O
in	O
February	O
2009	O
.	O
</s>
<s>
Claire	B-Language
is	O
a	O
general-purpose	B-Language
programming	I-Language
language	I-Language
,	O
best	O
suited	O
to	O
application	B-Application
software	I-Application
requiring	O
sophisticated	O
data	B-Application
modeling	I-Application
,	O
rule	B-Application
processing	I-Application
or	O
problem	O
solving	O
.	O
</s>
<s>
WebClaire	O
adds	O
extensions	O
for	O
fuller	O
integration	O
with	O
the	O
operating	B-General_Concept
system	I-General_Concept
and	O
for	O
programming	O
web	B-Application
applications	I-Application
.	O
</s>
<s>
Though	O
Claire	B-Language
can	O
be	O
used	O
for	O
complete	O
projects	O
,	O
it	O
is	O
designed	O
to	O
integrate	O
smoothly	O
with	O
C++	B-Language
or	O
Java	B-Language
:	O
Claire	B-Language
programs	O
may	O
include	O
C++	B-Language
or	O
Java	B-Language
code	I-Language
,	O
and	O
Claire	B-Language
code	O
may	O
be	O
translated	O
into	O
C++	B-Language
or	O
Java	B-Language
for	O
use	O
in	O
C++	B-Language
or	O
Java	B-Language
projects	O
.	O
</s>
<s>
The	O
key	O
set	O
of	O
features	O
that	O
distinguishes	O
Claire	B-Language
from	O
other	O
programming	O
languages	O
has	O
been	O
dictated	O
by	O
experience	O
in	O
solving	O
complex	O
optimization	O
problems	O
.	O
</s>
<s>
Two	O
features	O
not	O
found	O
in	O
other	O
mixed	O
functional/object	O
-oriented	O
languages	O
,	O
such	O
as	O
OCaml	B-Language
,	O
Scala	B-Application
and	O
F#	B-Operating_System
,	O
are	O
versioning	O
and	O
production	B-Application
rules	I-Application
.	O
</s>
<s>
Creation	O
and	O
roll-back	O
of	O
versions	O
permit	O
backtracking	B-Algorithm
,	O
as	O
found	O
in	O
logic	B-Language
programming	I-Language
,	O
though	O
Claire	B-Language
's	O
backtracking	B-Algorithm
may	O
cover	O
any	O
user-defined	O
structure	O
rather	O
than	O
just	O
a	O
set	O
of	O
logic	O
variables	O
.	O
</s>
<s>
A	O
production	O
rule	O
in	O
Claire	B-Language
is	O
composed	O
of	O
an	O
event	O
,	O
a	O
condition	O
and	O
a	O
response	O
to	O
be	O
evaluated	O
if	O
the	O
condition	O
is	O
satisfied	O
.	O
</s>
<s>
An	O
event	O
may	O
be	O
any	O
change	O
in	O
an	O
object	O
's	O
slot	O
or	O
the	O
instantiation	O
of	O
a	O
class	O
,	O
and	O
a	O
response	O
may	O
itself	O
set	O
off	O
further	O
events	B-General_Concept
.	O
</s>
<s>
Such	O
production	B-Application
rules	I-Application
are	O
especially	O
useful	O
in	O
describing	O
reactive	O
algorithms	O
,	O
such	O
as	O
those	O
for	O
constraint	B-Application
propagation	O
.	O
</s>
<s>
Claire	B-Language
was	O
created	O
as	O
a	O
successor	O
to	O
LAURE	O
,	O
an	O
expressive	O
but	O
complex	O
language	O
designed	O
by	O
Caseau	O
in	O
the	O
1980s	O
that	O
combined	O
many	O
paradigms	O
.	O
</s>
<s>
Claire	B-Language
was	O
intended	O
to	O
be	O
both	O
easier	O
to	O
learn	O
than	O
its	O
predecessor	O
and	O
to	O
impose	O
no	O
performance	O
overhead	O
relative	O
to	O
C++	B-Language
;	O
it	O
is	O
thus	O
a	O
much	O
smaller	O
language	O
,	O
omitting	O
features	O
such	O
as	O
constraints	B-Application
and	O
deductive	B-Language
rules	O
,	O
and	O
is	O
closer	O
to	O
C	B-Language
in	O
spirit	O
and	O
syntax	B-Application
.	O
</s>
