<s>
Keyhole	O
Markup	O
Language	O
(	O
KML	O
)	O
is	O
an	O
XML	B-Protocol
notation	O
for	O
expressing	O
geographic	O
annotation	O
and	O
visualization	O
within	O
two-dimensional	O
maps	O
and	O
three-dimensional	O
Earth	O
browsers	O
.	O
</s>
<s>
KML	O
was	O
developed	O
for	O
use	O
with	O
Google	B-Application
Earth	I-Application
,	O
which	O
was	O
originally	O
named	O
Keyhole	O
Earth	B-Application
Viewer	I-Application
.	O
</s>
<s>
It	O
was	O
created	O
by	O
Keyhole	O
,	O
Inc	O
,	O
which	O
was	O
acquired	O
by	O
Google	B-Application
in	O
2004	O
.	O
</s>
<s>
Google	B-Application
Earth	I-Application
was	O
the	O
first	O
program	O
able	O
to	O
view	O
and	O
graphically	O
edit	O
KML	O
files	O
,	O
but	O
other	O
projects	O
such	O
as	O
Marble	B-Application
have	O
added	O
KML	O
support	O
.	O
</s>
<s>
that	O
can	O
be	O
displayed	O
on	O
maps	O
in	O
geospatial	B-Application
software	I-Application
implementing	O
the	O
KML	O
encoding	O
.	O
</s>
<s>
Some	O
KML	O
information	O
cannot	O
be	O
viewed	O
in	O
Google	B-Application
Maps	O
or	O
Mobile	O
.	O
</s>
<s>
KML	O
files	O
are	O
very	O
often	O
distributed	O
as	O
KMZ	O
files	O
,	O
which	O
are	O
zipped	B-General_Concept
KML	O
files	O
with	O
a	O
.kmz	B-General_Concept
extension	O
.	O
</s>
<s>
The	O
MIME	B-Application
type	I-Application
associated	O
with	O
KML	O
is	O
application/vnd.google	O
-earth.kml	O
+xml	O
;	O
the	O
MIME	B-Application
type	I-Application
associated	O
with	O
KMZ	O
is	O
application/vnd.google	O
-earth.kmz	O
.	O
</s>
<s>
The	O
KML	O
2.2	O
specification	O
was	O
submitted	O
to	O
the	O
Open	O
Geospatial	O
Consortium	O
to	O
assure	O
its	O
status	O
as	O
an	O
open	O
standard	O
for	O
all	O
geobrowsers	B-Application
.	O
</s>
