<s>
WDDX	B-Protocol
(	O
Web	O
Distributed	O
Data	O
eXchange	O
)	O
is	O
a	O
programming	O
language-	O
,	O
platform	O
-	O
and	O
transport-neutral	O
data	O
interchange	O
mechanism	O
designed	O
to	O
pass	O
data	O
between	O
different	O
environments	O
and	O
different	O
computers	O
.	O
</s>
<s>
WDDX	B-Protocol
was	O
created	O
by	O
Simeon	O
Simeonov	O
of	O
Allaire	O
Corporation	O
in	O
1998	O
,	O
initially	O
for	O
the	O
ColdFusion	B-Language
server	O
environment	O
.	O
</s>
<s>
WDDX	B-Protocol
was	O
open-sourced	O
later	O
that	O
year	O
.	O
</s>
<s>
WDDX	B-Protocol
is	O
functionally	O
comparable	O
to	O
XML-RPC	B-Protocol
and	O
WIDL	O
.	O
</s>
<s>
The	O
data	O
is	O
encoded	O
into	O
XML	B-Protocol
using	O
an	O
XML	B-Protocol
1.0	O
DTD	B-Language
,	O
producing	O
a	O
platform-independent	O
but	O
relatively	O
bulky	O
representation	O
.	O
</s>
<s>
The	O
XML-encoded	O
data	O
can	O
then	O
be	O
sent	O
to	O
another	O
computer	O
using	O
HTTP	B-Protocol
,	O
FTP	B-Protocol
,	O
or	O
other	O
transmission	O
mechanism	O
.	O
</s>
<s>
The	O
receiving	O
computer	O
must	O
have	O
WDDX-aware	O
software	O
to	O
translate	O
the	O
encoded	O
data	O
into	O
the	O
receiver	O
's	O
native	O
data	O
representation	O
.	O
</s>
<s>
WDDX	B-Protocol
can	O
also	O
be	O
used	O
to	O
serialize	B-Application
data	I-Application
structures	I-Application
to	O
storage	O
(	O
file	O
system	O
or	O
database	O
)	O
.	O
</s>
<s>
Many	O
applications	O
use	O
WDDX	B-Protocol
to	O
pass	O
complex	O
data	O
to	O
browsers	O
where	O
it	O
can	O
be	O
manipulated	O
with	O
JavaScript	B-Language
,	O
as	O
an	O
alternative	O
to	O
JSON	B-General_Concept
.	O
</s>
<s>
Example	O
from	O
php.net	B-Application
:	O
</s>
<s>
WDDX	B-Protocol
is	O
mainly	O
used	O
by	O
ColdFusion	B-Language
and	O
,	O
as	O
February	O
2022	O
,	O
still	O
supported	O
by	O
Adobe	O
.	O
</s>
<s>
Outside	O
ColdFusion	B-Language
,	O
libraries	O
exist	O
to	O
read	O
or	O
write	O
this	O
format	O
,	O
Ruby	B-Language
,	O
Python	B-Language
,	O
PHP	B-Application
,	O
Java	B-Language
,	O
C++	B-Language
,	O
.NET	O
,	O
Actionscript	B-Operating_System
,	O
lisp	B-Language
,	O
Haskell	B-Language
,	O
Perl	B-Language
.	O
</s>
<s>
PHP	B-Application
used	O
to	O
offer	O
a	O
comprehensive	O
support	O
for	O
WDDX	B-Protocol
,	O
which	O
could	O
be	O
used	O
as	O
a	O
format	O
to	O
store	O
session	O
information	O
until	O
the	O
version	O
7.4	O
.	O
</s>
<s>
The	O
rationale	O
was	O
a	O
lack	O
of	O
standardization	O
of	O
the	O
format	O
,	O
and	O
new	O
formats	O
like	O
JSON	B-General_Concept
more	O
mainstream	O
.	O
</s>
