<s>
Metro	B-Language
is	O
a	O
high-performance	O
,	O
extensible	O
,	O
easy-to-use	O
web	O
service	O
stack	B-Application
.	O
</s>
<s>
Although	O
historically	O
an	O
open-source	B-License
part	O
of	O
the	O
GlassFish	B-Language
application	I-Language
server	I-Language
,	O
it	O
can	O
also	O
be	O
used	O
in	O
a	O
stand-alone	O
configuration	O
.	O
</s>
<s>
Components	O
of	O
Metro	B-Language
include	O
:	O
JAXB	B-Language
RI	I-Language
,	O
JAX-WS	B-Language
RI	O
,	O
SAAJ	B-Language
RI	O
,	O
StAX	B-Language
(	O
SJSXP	O
implementation	O
)	O
and	O
WSIT	O
.	O
</s>
<s>
Originally	O
,	O
the	O
Glassfish	B-Language
project	O
developed	O
two	O
semi-independent	O
projects	O
:	O
</s>
<s>
WSIT	O
,	O
a	O
Java	B-Language
implementation	O
of	O
some	O
of	O
the	O
WS-*	O
and	O
an	O
enhanced	O
support	O
for	O
interoperability	O
with	O
the	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
It	O
is	O
based	O
on	O
JAX-WS	B-Language
RI	O
as	O
"	O
Web	O
Service	O
layer	O
"	O
.	O
</s>
<s>
In	O
June	O
2007	O
,	O
it	O
was	O
decided	O
to	O
bundle	O
these	O
two	O
components	O
as	O
a	O
single	O
component	O
named	O
Metro	B-Language
.	O
</s>
<s>
Metro	B-Language
compares	O
well	O
with	O
other	O
web	O
service	O
frameworks	O
in	O
terms	O
of	O
functionality	O
.	O
</s>
<s>
Codehaus	O
started	O
a	O
comparison	O
which	O
compared	O
Apache	O
Axis	O
1.x	O
,	O
Axis	O
2.x	O
,	O
Celtix	B-Language
,	O
Glue	O
,	O
JBossWS	B-Language
,	O
Xfire	O
1.2	O
and	O
JAX-WS	B-Language
RI	O
+	O
WSIT	O
(	O
the	O
bundle	O
was	O
not	O
yet	O
named	O
Metro	B-Language
at	O
that	O
time	O
)	O
.	O
</s>
<s>
This	O
was	O
later	O
updated	O
by	O
the	O
ASF	O
to	O
replace	O
Celtix	B-Language
with	O
CXF	B-Language
and	O
to	O
include	O
OracleAS	B-Language
10g	I-Language
.	O
</s>
<s>
Metro	B-Language
includes	O
JAXB	B-Language
RI	I-Language
,	O
JAX-WS	B-Language
RI	O
,	O
SAAJ	B-Language
RI	O
,	O
SJSXP	O
,	O
and	O
WSIT	O
,	O
along	O
with	O
libraries	O
that	O
those	O
components	O
depend	O
on	O
,	O
such	O
as	O
xmlstreambuffer	O
,	O
mimepull	O
,	O
etc	O
.	O
</s>
<s>
Metro	B-Language
augments	O
the	O
JAX-WS	B-Language
environment	O
with	O
advanced	O
features	O
such	O
as	O
trusted	O
,	O
end-to-end	O
security	O
;	O
optimized	O
transport	O
(	O
MTOM	O
,	O
Fast	B-Protocol
Infoset	I-Protocol
)	O
,	O
reliable	O
messaging	O
,	O
and	O
transactional	O
behavior	O
for	O
SOAP	O
web	O
services	O
.	O
</s>
<s>
Metro	B-Language
is	O
bundled	O
with	O
Java	B-Language
SE	I-Language
6	O
in	O
order	O
to	O
allow	O
consumers	O
of	O
Java	B-Language
SE	I-Language
6	O
to	O
consume	O
Web	O
Services	O
.	O
</s>
<s>
Metro	B-Language
is	O
bundled	O
with	O
numerous	O
application	B-Application
servers	I-Application
such	O
as	O
:	O
</s>
<s>
The	O
JAXB	B-Language
reference	O
implementation	O
developed	O
for	O
Metro	B-Language
is	O
used	O
in	O
virtually	O
every	O
Java	B-Language
Web	O
Services	O
framework	O
(	O
Apache	B-Language
Axis2	I-Language
,	O
Codehaus	B-Language
XFire	I-Language
,	O
Apache	B-Language
CXF	I-Language
)	O
and	O
Application	B-Application
Servers	I-Application
.	O
</s>
