<s>
ECMAScript	B-Language
for	I-Language
XML	I-Language
(	O
E4X	B-Language
)	O
is	O
the	O
standard	O
programming	O
language	O
extension	O
that	O
adds	O
native	O
XML	B-Protocol
support	O
to	O
ECMAScript	B-Language
(	O
which	O
includes	O
ActionScript	B-Operating_System
,	O
JavaScript	B-Language
,	O
and	O
JScript	B-Language
)	O
.	O
</s>
<s>
The	O
goal	O
is	O
to	O
provide	O
an	O
alternative	O
to	O
DOM	B-General_Concept
interfaces	O
that	O
uses	O
a	O
simpler	O
syntax	O
for	O
accessing	O
XML	B-Protocol
documents	I-Protocol
.	O
</s>
<s>
It	O
also	O
offers	O
a	O
new	O
way	O
of	O
making	O
XML	B-Protocol
visible	O
.	O
</s>
<s>
Before	O
the	O
release	O
of	O
E4X	B-Language
,	O
XML	B-Protocol
was	O
always	O
accessed	O
at	O
an	O
object	O
level	O
.	O
</s>
<s>
E4X	B-Language
instead	O
treats	O
XML	B-Protocol
as	O
a	O
primitive	O
(	O
like	O
characters	O
,	O
integers	O
,	O
and	O
booleans	O
)	O
.	O
</s>
<s>
E4X	B-Language
is	O
standardized	O
by	O
Ecma	O
International	O
in	O
the	O
.	O
</s>
<s>
The	O
E4X	B-Language
standard	O
was	O
deprecated	O
by	O
the	O
Mozilla	O
Foundation	O
in	O
2014	O
.	O
</s>
<s>
E4X	B-Language
is	O
supported	O
by	O
Mozilla	O
's	O
Rhino	B-Language
,	O
used	O
in	O
OpenOffice.org	B-Application
and	O
several	O
other	O
projects	O
.	O
</s>
<s>
It	O
is	O
also	O
supported	O
by	O
Tamarin	B-Language
,	O
the	O
JavaScript	B-Language
engine	O
used	O
in	O
the	O
Flash	B-Operating_System
virtual	O
machine	O
.	O
</s>
<s>
It	O
is	O
not	O
supported	O
by	O
other	O
common	O
engines	O
like	O
Nitro	O
(	O
Safari	B-Application
)	O
,	O
V8	B-Language
(	O
Google	B-Application
Chrome	I-Application
)	O
,	O
Carakan	O
(	O
Opera	B-Application
)	O
,	O
Chakra	B-Language
(	O
Internet	B-Application
Explorer	I-Application
and	O
pre-Chromium	O
Edge	B-Application
)	O
.	O
</s>
<s>
E4X	B-Language
was	O
also	O
supported	O
by	O
SpiderMonkey	B-Language
(	O
used	O
in	O
Firefox	B-Application
and	O
Thunderbird	B-Application
)	O
,	O
but	O
has	O
been	O
removed	O
.	O
</s>
<s>
In	O
Firefox	B-Application
10	O
,	O
E4X	B-Language
syntax	O
was	O
no	O
longer	O
accepted	O
in	O
SpiderMonkey	B-Language
when	O
ECMAScript	B-Language
5	O
"	O
strict	O
mode	O
"	O
is	O
enabled	O
.	O
</s>
<s>
According	O
to	O
Brendan	O
Eich	O
,	O
"	O
This	O
thus	O
signals	O
start	O
of	O
deprecation	O
for	O
E4X	B-Language
in	O
SpiderMonkey.	O
"	O
</s>
<s>
The	O
first	O
implementation	O
of	O
E4X	B-Language
was	O
designed	O
by	O
Terry	O
Lucas	O
and	O
John	O
Schneider	O
and	O
appeared	O
in	O
BEA	O
's	O
Weblogic	O
Workshop	O
7.0	O
released	O
in	O
February	O
2002	O
.	O
</s>
<s>
BEA	O
's	O
implementation	O
was	O
based	O
on	O
Rhino	B-Language
and	O
released	O
before	O
the	O
ECMAScript	B-Language
E4X	B-Language
spec	O
was	O
completed	O
in	O
June	O
2004	O
.	O
</s>
<s>
John	O
Schneider	O
wrote	O
an	O
on	O
the	O
XML	B-Protocol
extensions	O
in	O
BEA	O
's	O
Workshop	O
at	O
the	O
time	O
.	O
</s>
<s>
E4X	B-Language
was	O
implemented	O
in	O
SpiderMonkey	B-Language
(	O
Gecko	B-Language
's	O
JavaScript	B-Language
engine	O
)	O
since	O
version	O
1.6.0	O
until	O
version	O
20	O
,	O
and	O
is	O
in	O
Rhino	B-Language
(	O
Mozilla	O
's	O
other	O
JavaScript	B-Language
engine	O
written	O
in	O
Java	O
instead	O
of	O
C	O
)	O
since	O
version	O
1.6R1	O
.	O
</s>
<s>
As	O
Mozilla	B-Application
Firefox	I-Application
is	O
based	O
on	O
Gecko	B-Language
,	O
older	O
versions	O
could	O
be	O
used	O
to	O
run	O
scripts	O
using	O
E4X	B-Language
.	O
</s>
<s>
Adobe	O
's	O
ActionScript	B-Operating_System
3	O
scripting	O
language	O
fully	O
supports	O
E4X	B-Language
.	O
</s>
<s>
Early	O
previews	O
of	O
ActionScript	B-Operating_System
3	O
were	O
first	O
made	O
available	O
in	O
late	O
2005	O
.	O
</s>
<s>
Adobe	O
officially	O
released	O
the	O
language	O
with	O
Flash	B-Operating_System
Player	I-Operating_System
9	I-Operating_System
on	O
June	O
28	O
,	O
2006	O
.	O
</s>
<s>
E4X	B-Language
is	O
available	O
in	O
Flash	B-Operating_System
CS3	I-Operating_System
,	O
Adobe	B-Operating_System
AIR	I-Operating_System
and	O
Adobe	B-Operating_System
Flex	I-Operating_System
as	O
they	O
use	O
ActionScript	B-Operating_System
3	O
as	O
a	O
scripting	O
language	O
.	O
</s>
<s>
E4X	B-Language
is	O
also	O
available	O
in	O
Adobe	B-Application
Acrobat	I-Application
and	O
Adobe	B-Application
Reader	I-Application
versions	O
8.0	O
or	O
higher	O
(	O
notably	O
Forward	O
Ported	O
from	O
SpiderMonkey	B-Language
version	O
17	O
and	O
suggested	O
may	O
be	O
dropped	O
in	O
the	O
near	O
future	O
)	O
.	O
</s>
<s>
E4X	B-Language
is	O
also	O
available	O
in	O
Aptana	B-General_Concept
's	O
Jaxer	O
Ajax	O
application	O
server	O
which	O
uses	O
the	O
Mozilla	O
engine	O
server-side	O
.	O
</s>
<s>
Since	O
the	O
release	O
of	O
Alfresco	O
Community	O
Edition	O
2.9B	O
,	O
E4X	B-Language
is	O
also	O
available	O
in	O
this	O
enterprise	O
document	O
management	O
system	O
.	O
</s>
<s>
E4X	B-Language
is	O
available	O
as	O
part	O
of	O
Mirth	B-Application
Connect	I-Application
's	O
JavaScript	B-Language
message	O
transformation	O
engine	O
.	O
</s>
