<s>
Seaside	B-Application
,	O
an	O
acronym	O
that	O
stands	O
for	O
“	O
Squeak	B-Operating_System
Enterprise	O
Aubergines	O
Server	O
with	O
Integrated	B-Application
Development	I-Application
Environment	I-Application
,	O
”	O
is	O
computer	O
software	O
,	O
a	O
web	B-Application
framework	I-Application
to	O
develop	O
web	B-Application
applications	I-Application
in	O
the	O
programming	O
language	O
Smalltalk	B-Application
.	O
</s>
<s>
It	O
is	O
distributed	O
as	O
free	B-License
and	I-License
open-source	I-License
software	I-License
under	O
an	O
MIT	B-License
License	I-License
.	O
</s>
<s>
Seaside	B-Application
provides	O
a	O
component	O
architecture	O
in	O
which	O
web	O
pages	O
are	O
built	O
as	O
trees	B-Application
of	O
individual	O
,	O
stateful	B-Application
components	O
,	O
each	O
encapsulating	O
a	O
small	O
part	O
of	O
a	O
page	O
.	O
</s>
<s>
Seaside	B-Application
uses	O
continuations	O
to	O
model	O
multiple	O
independent	O
flows	O
between	O
different	O
components	O
.	O
</s>
<s>
Thus	O
,	O
it	O
is	O
a	O
continuation-based	O
web	B-Application
framework	I-Application
based	O
on	O
the	O
ability	O
to	O
manipulate	O
the	O
execution	O
stack	O
of	O
some	O
implementations	O
of	O
Smalltalk	B-Application
.	O
</s>
<s>
Although	O
subsequent	O
improvement	O
of	O
state	O
handling	O
in	O
web	O
browser	O
JavaScript	B-Language
engines	O
have	O
meant	O
this	O
aspect	O
is	O
less	O
important	O
today	O
,	O
Seaside	B-Application
's	O
method	O
of	O
handling	O
of	O
browser	O
state	O
(	O
via	O
continuations	O
)	O
was	O
an	O
initial	O
point	O
of	O
interest	O
in	O
the	O
first	O
years	O
following	O
its	O
2002	O
release	O
.	O
</s>
<s>
This	O
mechanism	O
provides	O
for	O
rollback	O
and	O
resumption	O
,	O
resolving	O
many	O
common	O
issues	O
then	O
occurring	O
with	O
running	O
web	B-Application
applications	I-Application
,	O
adequately	O
sustaining	O
the	O
state	O
on	O
the	O
server-side	O
even	O
when	O
the	O
web	O
browser	O
's	O
'	O
back	O
 '	O
and	O
'	O
forward	O
 '	O
or	O
'	O
refresh	O
 '	O
buttons	O
are	O
used	O
.	O
</s>
<s>
A	O
distinctive	O
feature	O
of	O
Seaside	B-Application
is	O
its	O
integrated	B-Application
development	I-Application
environment	I-Application
,	O
providing	O
access	O
to	O
development	O
tools	O
and	O
debugging	O
support	O
within	O
an	O
application	O
.	O
</s>
<s>
In	O
development-mode	O
,	O
unhandled	O
errors	O
are	O
reported	O
to	O
the	O
web	O
page	O
;	O
developers	O
can	O
access	O
and	O
alter	O
the	O
program	O
code	O
and	O
state	O
directly	O
from	O
the	O
web	O
page	O
,	O
allowing	O
bug	O
identifying	O
and	O
fixing	O
processes	O
to	O
occur	O
within	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
.	O
</s>
<s>
A	O
Seaside	B-Application
application	O
is	O
a	O
set	O
of	O
interacting	O
components	O
.	O
</s>
<s>
Each	O
one	O
stores	O
state	O
across	O
page	O
views	O
and	O
can	O
render	O
itself	O
to	O
the	O
HTML	B-Language
stream	O
.	O
</s>
<s>
Seaside	B-Application
also	O
supports	O
the	O
notion	O
of	O
tasks	O
,	O
which	O
allow	O
a	O
programmer	O
to	O
describe	O
the	O
high-level	O
logic	O
of	O
component	O
interaction	O
.	O
</s>
<s>
Seaside	B-Application
is	O
not	O
template-oriented	O
,	O
and	O
does	O
not	O
offer	O
generating	O
or	O
using	O
HTML	B-Language
templates	O
;	O
HTML	B-Language
markup	O
is	O
generated	O
programmatically	O
.	O
</s>
<s>
(	O
The	O
Seaside-based	O
Pier	O
content-management	O
framework	O
does	O
offer	O
wiki-markup	O
syntax	O
for	O
templating	O
.	O
)	O
</s>
<s>
Seaside	B-Application
uses	O
callbacks	O
on	O
closures	B-Language
to	O
specify	O
actions	O
to	O
be	O
taken	O
when	O
clicking	O
on	O
a	O
link	O
or	O
submitting	O
a	O
form	O
.	O
</s>
<s>
The	O
developers	O
and	O
users	O
of	O
Seaside	B-Application
argue	O
that	O
this	O
helps	O
enforce	O
separation	O
of	O
structure	O
(	O
markup	O
)	O
from	O
content	O
and	O
presentation	O
(	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
)	O
.	O
</s>
<s>
Seaside	B-Application
's	O
combination	O
of	O
components	O
,	O
callbacks	O
,	O
and	O
closures	B-Language
can	O
significantly	O
reduce	O
the	O
semantic	O
gap	O
between	O
a	O
complex	O
workflow	O
and	O
its	O
representation	O
in	O
code	O
.	O
</s>
<s>
Seaside	B-Application
supports	O
Ajax	B-General_Concept
through	O
integration	O
with	O
script.aculo.us	B-Language
and	O
jQuery	B-Language
.	O
</s>
<s>
Seaside	B-Application
also	O
supports	O
Comet-style	O
server-push	O
technology	O
.	O
</s>
<s>
Seaside	B-Application
can	O
work	O
with	O
either	O
Smalltalk-based	O
web	O
server	O
implementations	O
or	O
other	O
non-Smalltalk	O
ones	O
(	O
Nginx	O
,	O
Apache	O
)	O
.	O
</s>
<s>
Seaside	B-Application
deliberately	O
breaks	O
all	O
of	O
these	O
rules	O
.	O
</s>
<s>
Avi	O
Bryant	O
,	O
then	O
of	O
Dabble	B-Application
DB	I-Application
,	O
in	O
2006	O
described	O
it	O
as	O
a	O
'	O
heretical	O
 '	O
framework	O
,	O
arguing	O
that	O
this	O
careful	O
and	O
reasoned	O
rejection	O
of	O
the	O
conventional	O
wisdoms	O
of	O
web	O
development	O
led	O
to	O
a	O
very	O
effective	O
model	O
for	O
developing	O
web	B-Application
applications	I-Application
.	O
</s>
<s>
The	O
main	O
development	O
of	O
Seaside	B-Application
is	O
implemented	O
in	O
Pharo	B-Language
Smalltalk	B-Application
.	O
</s>
<s>
Ports	O
for	O
other	O
Smalltalk	B-Application
dialects	O
exist	O
.	O
</s>
<s>
The	O
original	O
development	O
of	O
Seaside	B-Application
was	O
done	O
on	O
Squeak	B-Operating_System
in	O
the	O
early	O
2000s	O
.	O
</s>
<s>
Michel	O
Bany	O
implemented	O
ports	O
to	O
VisualWorks	B-Application
through	O
Seaside	B-Application
version	O
2.7	O
;	O
Cincom	B-Application
Systems	I-Application
supports	O
Seaside	B-Application
as	O
part	O
of	O
VisualWorks	B-Application
as	O
of	O
early	O
2008	O
.	O
</s>
<s>
Instantiations	O
announced	O
Seaside	B-Application
support	O
in	O
its	O
VAST	O
(	O
VA	O
Smalltalk	B-Application
)	O
Platform	O
version	O
8.0	O
in	O
2009	O
.	O
</s>
<s>
The	O
VAST	O
Platform	O
has	O
continued	O
to	O
support	O
Seaside	B-Application
through	O
its	O
latest	O
version	O
.	O
</s>
<s>
Esteban	O
Maringolo	O
maintained	O
the	O
2.8	O
port	O
,	O
plus	O
some	O
other	O
add-ons	O
(	O
such	O
as	O
script.aculo.us	B-Language
)	O
for	O
Dolphin	B-Application
Smalltalk	I-Application
X6	O
.	O
</s>
<s>
Gemstone	B-Operating_System
Systems	I-Operating_System
implemented	O
a	O
port	O
to	O
Gemstone/S	B-Operating_System
.	O
</s>
<s>
A	O
port	O
of	O
2.8	O
was	O
completed	O
for	O
GemStone	B-Operating_System
,	O
and	O
a	O
preliminary	O
version	O
of	O
3.0	O
runs	O
on	O
GNU	B-Application
Smalltalk	I-Application
3.0a	O
and	O
later	O
.	O
</s>
<s>
The	O
web	O
server	O
package	O
in	O
the	O
standard	O
library	O
of	O
Racket	B-Operating_System
(	O
Programming	O
language	O
)	O
uses	O
a	O
very	O
similar	O
philosophy	O
,	O
also	O
based	O
on	O
continuations	O
.	O
</s>
<s>
Compared	O
to	O
other	O
web	B-Application
frameworks	I-Application
,	O
Seaside	B-Application
is	O
memory	O
intensive	O
.	O
</s>
<s>
One	O
session	B-Protocol
could	O
accumulate	O
several	O
hundred	O
kilobytes	O
of	O
RAM	O
.	O
</s>
<s>
Seaside	B-Application
does	O
not	O
follow	O
representational	B-Protocol
state	I-Protocol
transfer	I-Protocol
(	O
REST	O
)	O
by	O
default	O
.	O
</s>
<s>
Instead	O
,	O
Uniform	O
Resource	O
Locators	O
(	O
URLs	O
)	O
hold	O
session	B-Protocol
key	O
information	O
,	O
and	O
meaningful	O
URLs	O
must	O
be	O
generated	O
explicitly	O
.	O
</s>
<s>
Many	O
open-source	O
projects	O
use	O
Seaside	B-Application
,	O
some	O
of	O
which	O
are	O
:	O
</s>
<s>
Many	O
proprietary	O
projects	O
use	O
Seaside	B-Application
,	O
some	O
of	O
which	O
are	O
:	O
</s>
<s>
Cmsbox	O
–	O
a	O
content	B-Protocol
management	I-Protocol
system	I-Protocol
(	O
CMS	O
)	O
made	O
available	O
by	O
netstyle.ch	O
for	O
the	O
Swiss	O
market	O
.	O
</s>
