<s>
2APL	B-Language
(	O
A	O
Practical	O
Agent	O
Programming	O
Language	O
)	O
is	O
a	O
modular	B-Architecture
BDI-based	O
programming	O
language	O
that	O
supports	O
the	O
development	O
of	O
multi-agent	O
systems	O
.	O
</s>
<s>
2APL	B-Language
provides	O
a	O
rich	O
set	O
of	O
programming	O
constructs	O
allowing	O
direct	O
implementation	O
of	O
concepts	O
such	O
as	O
beliefs	O
,	O
declarative	O
goals	O
,	O
actions	O
,	O
plans	O
,	O
events	O
,	O
and	O
reasoning	O
rules	O
.	O
</s>
<s>
2APL	B-Language
can	O
be	O
used	O
to	O
implement	O
muti-agent	O
systems	O
consisting	O
of	O
software	O
agents	O
with	O
reactive	O
as	O
well	O
as	O
pro-active	O
behaviours	O
.	O
</s>
<s>
2APL	B-Language
provides	O
programming	O
constructs	O
to	O
specify	O
both	O
multi-agent	O
systems	O
and	O
individual	O
agents	O
.	O
</s>
<s>
Basic	O
Actions	O
:	O
2APL	B-Language
provides	O
different	O
types	O
of	O
actions	O
,	O
among	O
which	O
,	O
</s>
<s>
Modules	B-Architecture
:	O
A	O
2APL	B-Language
agent	O
's	O
program	O
can	O
be	O
developed	O
in	O
separate	O
modules	B-Architecture
.	O
</s>
<s>
Each	O
module	B-Architecture
encapsulates	O
cognitive	O
components	O
such	O
as	O
beliefs	O
,	O
goals	O
,	O
plans	O
,	O
and	O
reasoning	O
rules	O
.	O
</s>
<s>
In	O
practice	O
,	O
a	O
2APL	B-Language
module	B-Architecture
can	O
be	O
used	O
to	O
program	O
a	O
specific	O
functionality	O
,	O
such	O
as	O
a	O
role	O
or	O
an	O
agent	O
profile	O
.	O
</s>
<s>
A	O
programmer	O
can	O
perform	O
a	O
wide	O
range	O
of	O
operations	O
on	O
modules	B-Architecture
,	O
e.g.	O
,	O
creating	O
a	O
module	B-Architecture
instance	O
,	O
updating	O
it	O
,	O
executing	O
it	O
,	O
and	O
testing	O
its	O
state	O
.	O
</s>
<s>
Environments	O
:	O
A	O
2APL	B-Language
environment	O
can	O
be	O
implemented	O
as	O
a	O
Java	O
object	O
.	O
</s>
<s>
The	O
2APL	B-Language
Platform	O
and	O
its	O
corresponding	O
Eclipse	O
plug-in	O
editor	O
are	O
developed	O
to	O
facilitate	O
the	O
development	O
and	O
execution	O
of	O
multi-agent	O
programs	O
.	O
</s>
<s>
The	O
execution	O
of	O
an	O
individual	O
2APL	B-Language
agent	O
program	O
is	O
realized	O
by	O
a	O
cyclic	O
sense-reason-act	O
process	O
,	O
called	O
the	O
deliberation	O
process	O
.	O
</s>
<s>
The	O
execution	O
of	O
a	O
2APL	B-Language
multi-agent	O
program	O
is	O
the	O
parallel	O
executions	O
of	O
the	O
involved	O
individual	O
agent	O
programs	O
.	O
</s>
