<s>
Spring	B-Language
Web	I-Language
Flow	I-Language
(	O
SWF	O
)	O
is	O
the	O
sub-project	O
of	O
the	B-Application
Spring	I-Application
Framework	I-Application
that	O
focuses	O
on	O
providing	O
the	O
infrastructure	O
for	O
building	O
and	O
running	O
rich	B-Application
web	I-Application
applications	I-Application
.	O
</s>
<s>
In	O
Spring	B-Language
Web	I-Language
Flow	I-Language
,	O
a	O
web	O
flow	O
answers	O
all	O
of	O
the	O
above	O
questions	O
:	O
it	O
captures	O
navigational	O
rules	O
allowing	O
the	O
Spring	B-Language
Web	I-Language
Flow	I-Language
execution	O
engine	O
to	O
manage	O
a	O
conversation	O
and	O
the	O
associated	O
state	O
.	O
</s>
<s>
Since	O
version	O
2.0	O
,	O
Spring	B-Language
Web	I-Language
Flow	I-Language
also	O
introduces	O
other	O
additional	O
features	O
supporting	O
the	O
construction	O
of	O
rich	B-Application
web	I-Application
applications	I-Application
,	O
such	O
as	O
AJAX	B-Device
support	O
and	O
tight	O
integration	O
with	O
JavaServer	B-Language
Faces	I-Language
.	O
</s>
<s>
The	O
Spring	B-Language
Web	I-Language
Flow	I-Language
project	O
started	O
as	O
a	O
simple	O
extension	O
to	O
the	O
Spring	O
Web	O
MVC	O
framework	O
providing	O
web	O
flow	O
functionality	O
,	O
developed	O
by	O
Erwin	O
Vervaet	O
in	O
2004	O
.	O
</s>
<s>
Version	O
2.0	O
,	O
first	O
released	O
on	O
2008-04-29	O
,	O
saw	O
a	O
major	O
internal	O
reorganization	O
of	O
the	O
framework	O
to	O
allow	O
better	O
integration	O
with	O
JavaServer	B-Language
Faces	I-Language
.	O
</s>
