<s>
GOLOG	B-General_Concept
is	O
a	O
high-level	O
logic	B-Language
programming	I-Language
language	I-Language
for	O
the	O
specification	O
and	O
execution	O
of	O
complex	O
actions	O
in	O
dynamical	O
domains	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
situation	B-Application
calculus	I-Application
.	O
</s>
<s>
GOLOG	B-General_Concept
was	O
developed	O
at	O
the	O
University	O
of	O
Toronto	O
.	O
</s>
<s>
The	O
concept	O
of	O
situation	B-Application
calculus	I-Application
on	O
which	O
the	O
GOLOG	B-General_Concept
programming	O
language	O
is	O
based	O
was	O
first	O
proposed	O
by	O
John	O
McCarthy	O
in	O
1963	O
.	O
</s>
<s>
A	O
GOLOG	B-General_Concept
interpreter	B-Application
automatically	O
maintains	O
a	O
direct	O
characterization	O
of	O
the	O
dynamic	O
world	O
being	O
modeled	O
,	O
on	O
the	O
basis	O
of	O
user	O
supplied	O
axioms	O
about	O
preconditions	O
,	O
effects	O
of	O
actions	O
and	O
the	O
initial	O
state	O
of	O
the	O
world	O
.	O
</s>
<s>
Golog	B-General_Concept
is	O
a	O
logic	B-Language
programming	I-Language
language	I-Language
and	O
is	O
very	O
different	O
from	O
conventional	O
programming	O
languages	O
.	O
</s>
<s>
A	O
procedural	B-Application
programming	I-Application
language	I-Application
like	O
C	O
defines	O
the	O
execution	O
of	O
statements	O
in	O
advance	O
.	O
</s>
<s>
In	O
contrast	O
,	O
fifth-generation	O
programming	O
languages	O
like	O
Golog	B-General_Concept
are	O
working	O
with	O
an	O
abstract	O
model	O
with	O
which	O
the	O
interpreter	B-Application
can	O
generate	O
the	O
sequence	O
of	O
actions	O
.	O
</s>
<s>
A	O
Golog	B-General_Concept
program	O
defines	O
the	O
state	O
space	O
in	O
which	O
the	O
agent	O
is	O
allowed	O
to	O
operate	O
.	O
</s>
<s>
A	O
path	O
in	O
the	O
symbolic	O
domain	O
is	O
found	O
with	O
state	B-Algorithm
space	I-Algorithm
search	I-Algorithm
.	O
</s>
<s>
To	O
speed	O
up	O
the	O
process	O
,	O
Golog	B-General_Concept
programs	O
are	O
realized	O
as	O
hierarchical	B-Application
task	I-Application
networks	I-Application
.	O
</s>
<s>
Apart	O
from	O
the	O
original	O
Golog	B-General_Concept
language	O
,	O
there	O
are	O
some	O
extensions	O
available	O
.	O
</s>
<s>
Golog	B-General_Concept
has	O
been	O
used	O
to	O
model	O
the	O
behavior	O
of	O
autonomous	O
agents	O
.	O
</s>
<s>
It	O
is	O
also	O
used	O
for	O
applications	O
in	O
high	O
level	O
control	O
of	O
robots	O
and	O
industrial	O
processes	O
,	O
virtual	O
agents	O
,	O
discrete	B-General_Concept
event	I-General_Concept
simulation	I-General_Concept
etc	O
.	O
</s>
<s>
In	O
contrast	O
to	O
the	O
Planning	B-Application
Domain	I-Application
Definition	I-Application
Language	I-Application
,	O
Golog	B-General_Concept
supports	O
planning	O
and	O
scripting	O
as	O
well	O
.	O
</s>
<s>
In	O
contrast	O
,	O
a	O
hardwired	O
reactive	O
behavior	O
does	O
n't	O
need	O
a	O
solver	O
but	O
the	O
action	O
sequence	O
is	O
provided	O
in	O
a	O
scripting	B-Language
language	I-Language
.	O
</s>
<s>
The	O
Golog	B-General_Concept
interpreter	B-Application
,	O
which	O
is	O
written	O
in	O
Prolog	B-Language
,	O
executes	O
the	O
script	O
and	O
this	O
will	O
bring	O
the	O
story	O
into	O
the	O
goal	O
state	O
.	O
</s>
