<s>
Ciao	B-Application
is	O
a	O
general-purpose	O
programming	O
language	O
which	O
supports	O
logic	B-Language
,	O
constraint	B-Application
,	O
functional	B-Language
,	O
higher-order	B-Application
,	O
and	O
object-oriented	B-Language
programming	I-Language
styles	O
.	O
</s>
<s>
Its	O
main	O
design	O
objectives	O
are	O
high	O
expressive	B-Language
power	I-Language
,	O
extensibility	B-Architecture
,	O
safety	O
,	O
reliability	O
,	O
and	O
efficient	O
execution	O
.	O
</s>
<s>
Ciao	B-Application
provides	O
a	O
full	O
Prolog	B-Language
system	O
(	O
supporting	O
ISO-Prolog	O
)	O
,	O
</s>
<s>
(	O
records	O
)	O
,	O
persistence	O
,	O
several	O
control	O
rules	O
(	O
breadth-first	B-Algorithm
search	I-Algorithm
,	O
iterative	O
deepening	O
,	O
...	O
)	O
,	O
concurrency	B-Operating_System
(	O
threads/engines	O
)	O
,	O
distributed	O
execution	O
(	O
agents	O
)	O
,	O
and	O
parallel	O
execution	O
.	O
</s>
<s>
Libraries	O
also	O
support	O
WWW	O
programming	O
,	O
sockets	O
,	O
external	O
interfaces	O
(	O
C	B-Language
,	O
Java	B-Language
,	O
TclTk	B-Operating_System
,	O
relational	B-Application
databases	I-Application
,	O
etc	O
.	O
</s>
<s>
These	O
restrictions	O
and	O
extensions	O
can	O
be	O
activated	O
separately	O
on	O
each	O
program	O
module	B-Architecture
so	O
that	O
several	O
extensions	O
can	O
coexist	O
in	O
the	O
same	O
application	O
for	O
different	O
modules	B-Architecture
.	O
</s>
<s>
Programming	O
in	O
the	O
large	O
in	O
Ciao	B-Application
is	O
supported	O
via	O
:	O
</s>
<s>
A	O
robust	O
module/object	O
system	O
.	O
</s>
<s>
This	O
provides	O
module-based	O
separate/incremental	O
compilation	O
(	O
which	O
is	O
automatic	O
without	O
need	O
for	O
makefiles	O
)	O
.	O
</s>
<s>
Ciao	B-Application
includes	O
lpdoc	O
,	O
an	O
automatic	O
documentation	O
generator	O
.	O
</s>
