<s>
The	O
Mozilla	B-Application
application	I-Application
framework	I-Application
is	O
a	O
collection	O
of	O
cross-platform	B-Operating_System
software	I-Operating_System
components	O
that	O
make	O
up	O
the	O
Mozilla	B-Operating_System
applications	O
.	O
</s>
<s>
It	O
was	O
originally	O
known	O
as	O
XPFE	B-Application
,	O
an	O
abbreviation	O
of	O
cross-platform	B-Operating_System
front	O
end	O
.	O
</s>
<s>
It	O
was	O
also	O
known	O
as	O
XPToolkit	B-Application
.	O
</s>
<s>
To	O
avoid	O
confusion	O
,	O
it	O
is	O
now	O
referred	O
to	O
as	O
the	O
Mozilla	B-Application
application	I-Application
framework	I-Application
.	O
</s>
<s>
While	O
similar	O
to	O
generic	O
cross-platform	B-Operating_System
application	B-Application
frameworks	I-Application
like	O
GTK+	B-Application
,	O
Qt	B-Language
and	O
wxWidgets	B-Language
,	O
the	O
intent	O
is	O
to	O
provide	O
a	O
subset	O
of	O
cross-platform	B-Operating_System
functionality	O
suitable	O
for	O
building	O
network	O
applications	O
like	O
web	B-Application
browsers	I-Application
,	O
leveraging	O
the	O
cross-platform	B-Operating_System
functionality	O
already	O
built	O
into	O
the	O
Gecko	B-Language
layout	I-Language
engine	I-Language
.	O
</s>
<s>
Gecko	B-Language
Gecko	B-Language
is	O
a	O
standard-based	O
layout	B-Protocol
engine	I-Protocol
designed	O
for	O
performance	O
and	O
portability	O
.	O
</s>
<s>
Necko	B-Application
Necko	B-Application
provides	O
an	O
extensible	O
API	O
for	O
several	O
layers	O
of	O
networking	O
from	O
transport	O
to	O
presentation	O
layers	O
.	O
</s>
<s>
XUL	B-Application
XUL	B-Application
is	O
the	O
basis	O
of	O
user	B-Application
interface	I-Application
.	O
</s>
<s>
It	O
is	O
an	O
application	B-Application
of	O
XML	B-Protocol
that	O
defines	O
various	O
user	B-Application
interfaces	I-Application
elements	O
,	O
mostly	O
widgets	O
,	O
control	O
elements	O
,	O
template	O
,	O
etc	O
.	O
</s>
<s>
It	O
is	O
similar	O
in	O
many	O
ways	O
to	O
HTML	B-Language
.	O
</s>
<s>
XBL	B-Application
XBL	B-Application
allows	O
one	O
to	O
define	O
their	O
own	O
widget	O
for	O
use	O
in	O
XUL	B-Application
.	O
</s>
<s>
XPConnect	O
XPConnect	O
is	O
the	O
binding	O
between	O
XPCOM	B-Application
and	O
JavaScript	B-Language
.	O
</s>
<s>
XPInstall	B-Application
XPInstall	B-Application
is	O
a	O
technology	O
for	O
installing	O
small	O
packages	O
like	O
extensions	O
and	O
themes	O
into	O
Mozilla	B-Operating_System
applications	O
in	O
form	O
of	O
installation	O
archives	O
known	O
as	O
XPI	B-Application
.	O
</s>
<s>
Web	O
services	O
Mozilla	B-Operating_System
includes	O
built-in	O
support	O
for	O
popular	O
web	O
services	O
standards	O
XML-RPC	B-Protocol
,	O
SOAP	B-Application
(	O
dropped	O
since	O
Gran	O
Paradiso	O
Alpha	O
7	O
)	O
,	O
and	O
WSDL	O
as	O
well	O
as	O
a	O
simple	O
XMLHttpRequest	B-Protocol
object	O
similar	O
to	O
the	O
one	O
in	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
Others	O
The	O
framework	O
supports	O
a	O
number	O
of	O
open	O
or	O
common	O
standards	O
,	O
including	O
DTD	B-Language
,	O
RDF	O
,	O
XSLT/XPath	O
,	O
MathML	B-Language
,	O
SVG	B-Application
,	O
JavaScript	B-Language
,	O
SQL	B-Language
,	O
LDAP	B-Protocol
,	O
etc	O
.	O
</s>
