<s>
A	O
timing	B-Language
diagram	I-Language
in	O
the	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
2.0	O
is	O
a	O
specific	O
type	O
of	O
interaction	O
diagram	O
,	O
where	O
the	O
focus	O
is	O
on	O
timing	O
constraints	O
.	O
</s>
<s>
Timing	B-Language
diagrams	I-Language
are	O
used	O
to	O
explore	O
the	O
behaviors	O
of	O
objects	O
throughout	O
a	O
given	O
period	O
of	O
time	O
.	O
</s>
<s>
A	O
timing	B-Language
diagram	I-Language
is	O
a	O
special	O
form	O
of	O
a	O
sequence	O
diagram	O
.	O
</s>
<s>
The	O
differences	O
between	O
timing	B-Language
diagram	I-Language
and	O
sequence	O
diagram	O
are	O
the	O
axes	O
are	O
reversed	O
so	O
that	O
the	O
time	O
increases	O
from	O
left	O
to	O
right	O
and	O
the	O
lifelines	O
are	O
shown	O
in	O
separate	O
compartments	O
arranged	O
vertically	O
.	O
</s>
<s>
There	O
are	O
two	O
basic	O
flavors	O
of	O
timing	B-Language
diagram	I-Language
:	O
the	O
concise	O
notation	O
,	O
and	O
the	O
robust	O
notation	O
.	O
</s>
