<s>
The	O
scheduling	B-Architecture
open	I-Architecture
service	I-Architecture
interface	I-Architecture
definition	I-Architecture
(	O
OSID	B-Architecture
)	O
is	O
an	O
Open	O
Knowledge	O
Initiative	O
specification	B-Application
.	O
</s>
<s>
OSIDs	B-Architecture
are	O
programmatic	O
interfaces	O
which	O
comprise	O
a	O
service-oriented	O
architecture	O
for	O
designing	O
and	O
building	O
reusable	B-Application
and	O
interoperable	O
software	O
.	O
</s>
<s>
The	O
Scheduling	B-Architecture
OSID	I-Architecture
provides	O
a	O
means	O
of	O
associating	O
Agents	B-Architecture
with	O
specific	O
activities	O
(	O
ScheduleItems	O
)	O
.	O
</s>
<s>
This	O
OSID	B-Architecture
provides	O
a	O
way	O
for	O
an	O
application	B-Application
to	O
integrate	B-Architecture
or	O
use	O
an	O
external	O
calendaring	O
system	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
an	O
application	B-Application
can	O
provide	O
calendaring	O
functionality	O
while	O
still	O
allowing	O
integration	O
with	O
an	O
existing	O
Enterprise	O
calendar	O
system	O
,	O
such	O
as	O
one	O
based	O
on	O
CalDAV	B-Protocol
,	O
for	O
example	O
.	O
</s>
