<s>
The	O
Open	B-Language
Collaboration	I-Language
Services	I-Language
(	O
OCS	O
)	O
is	O
an	O
open	O
and	O
vendor-independent	O
REST-based	O
API	B-Application
for	O
integration	O
of	O
web	O
communities	O
and	O
web-based	O
services	O
into	O
desktop	O
and	O
mobile	O
applications	O
.	O
</s>
<s>
The	O
protocol	O
is	O
designed	O
so	O
that	O
all	O
applications	O
can	O
access	O
multiple	O
services	O
providing	O
OCS	O
APIs	B-Application
.	O
</s>
<s>
The	O
initial	O
API	B-Application
design	O
was	O
done	O
by	O
openDesktop.org	B-Language
as	O
part	O
of	O
the	O
Social	O
Desktop	O
,	O
especially	O
as	O
a	O
cross-desktop	O
backend	B-Architecture
provider	O
.	O
</s>
<s>
The	O
API	B-Application
was	O
standardised	O
by	O
freedesktop.org	B-Application
so	O
that	O
third-party	O
providers	O
are	O
able	O
to	O
implement	O
OCS	O
API	B-Application
.	O
</s>
<s>
Non-KDE	O
environments	O
using	O
the	O
API	B-Application
in	O
the	O
past	O
included	O
the	O
Maemo	B-Operating_System
Downloads	O
application	O
store	O
and	O
Apps	O
for	O
MeeGo	B-Operating_System
.	O
</s>
