<s>
In	O
the	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
,	O
an	O
action	O
is	O
a	O
named	O
element	O
that	O
is	O
the	O
fundamental	O
unit	O
of	O
executable	B-Application
functionality	O
.	O
</s>
<s>
The	O
execution	O
of	O
an	O
action	O
represents	O
some	O
transformation	B-Algorithm
or	O
processing	O
in	O
the	O
modeled	O
system	O
.	O
</s>
<s>
An	O
action	O
execution	O
represents	O
the	O
run-time	B-Library
behavior	O
of	O
executing	O
an	O
action	O
within	O
a	O
specific	O
behavior	O
execution	O
.	O
</s>
<s>
An	O
action	O
is	O
the	O
specification	O
of	O
an	O
executable	B-Application
statement	O
and	O
is	O
the	O
fundamental	O
unit	O
of	O
processing	O
or	O
behavior	O
in	O
an	O
activity	O
node	O
that	O
represents	O
some	O
transformation	B-Algorithm
in	O
the	O
modeled	O
system	O
.	O
</s>
<s>
An	O
action	O
forms	O
an	O
abstraction	O
of	O
a	O
computational	O
procedure	O
which	O
is	O
an	O
atomic	B-General_Concept
execution	O
and	O
therefore	O
completes	O
without	O
interruption	O
.	O
</s>
<s>
An	O
action	O
is	O
a	O
result	O
of	O
a	O
system	O
state	B-Application
change	O
and	O
is	O
realized	O
by	O
sending	O
a	O
message	O
to	O
an	O
object	O
or	O
modifying	O
a	O
link	O
or	O
a	O
value	O
of	O
an	O
attribute	B-General_Concept
.	O
</s>
<s>
An	O
action	O
refers	O
to	O
the	O
suite	O
of	O
rules	O
and	O
policies	O
associated	O
with	O
a	O
state	B-Architecture
machine	I-Architecture
state	B-Application
,	O
and	O
is	O
represented	O
as	O
an	O
object	O
method	O
.	O
</s>
<s>
An	O
action	O
behavior	O
accompanies	O
a	O
transition	O
event	B-Application
.	O
</s>
<s>
On	O
Event	B-Application
:	O
occurs	O
upon	O
a	O
specific	O
event	B-Application
.	O
</s>
