<s>
Nevow	B-Language
(	O
pronounced	O
like	O
the	O
French	O
nouveau	O
)	O
is	O
a	O
Python	B-Language
web	B-Application
application	I-Application
framework	I-Application
originally	O
developed	O
by	O
the	O
company	O
Divmod	O
.	O
</s>
<s>
Template	O
substitution	O
is	O
achieved	O
via	O
a	O
small	O
Tag	B-Language
Attribute	I-Language
Language	I-Language
,	O
which	O
is	O
usually	O
embedded	O
in	O
on-disk	O
XML	B-Protocol
templates	O
,	O
though	O
there	O
is	O
also	O
a	O
pure-Python	O
domain-specific	B-Language
language	I-Language
called	O
Stan	O
,	O
for	O
expressing	O
this	O
markup	O
programmatically	O
.	O
</s>
<s>
Nevow	B-Language
integrates	O
well	O
with	O
Twisted	B-Language
,	O
a	O
framework	O
for	O
event-driven	B-Application
programming	I-Application
.	O
</s>
<s>
Nevow	B-Language
had	O
960	O
unit	O
tests	O
as	O
of	O
June	O
2008	O
,	O
and	O
was	O
deployed	O
on	O
several	O
high-profile	O
web	O
sites	O
,	O
most	O
notably	O
the	O
official	O
Python	B-Language
site	O
.	O
</s>
<s>
As	O
of	O
mid-2010	O
,	O
Divmod	O
went	O
out	O
of	O
business	O
,	O
causing	O
development	O
work	O
on	O
Nevow	B-Language
to	O
all	O
but	O
cease	O
,	O
and	O
in	O
2011	O
its	O
homepage	O
was	O
no	O
longer	O
accessible	O
.	O
</s>
<s>
There	O
is	O
a	O
project	O
on	O
Launchpad	B-Protocol
,	O
hosting	O
the	O
source	O
code	O
of	O
Divmod	O
including	O
the	O
source	O
code	O
of	O
the	O
Nevow	B-Language
project	O
.	O
</s>
<s>
Athena	O
is	O
a	O
Nevow	B-Language
component	O
which	O
facilitates	O
bi-directional	O
,	O
asynchronous	O
communication	O
between	O
the	O
Python	B-Language
and	O
JavaScript	B-Language
portions	O
of	O
a	O
web	O
application	O
in	O
the	O
form	O
of	O
remote	B-Operating_System
procedure	I-Operating_System
calls	I-Operating_System
.	O
</s>
<s>
This	O
technique	O
is	O
typically	O
called	O
Ajax	B-General_Concept
or	O
Comet	B-General_Concept
,	O
though	O
Nevow	B-Language
's	O
implementation	O
predates	O
both	O
of	O
these	O
labels	O
.	O
</s>
<s>
Athena	O
also	O
includes	O
an	O
inheritance-based	O
JavaScript	B-Language
object	B-Language
system	I-Language
,	O
which	O
forms	O
the	O
basis	O
of	O
a	O
client-side	O
widget	O
abstraction	O
,	O
module	B-Architecture
system	I-Architecture
and	O
in-browser	O
unit	O
testing	O
kit	O
.	O
</s>
