<s>
The	O
Messaging	B-Architecture
Open	I-Architecture
Service	I-Architecture
Interface	I-Architecture
Definition	I-Architecture
(	O
OSID	B-Architecture
)	O
is	O
an	O
O.K.I.	O
</s>
<s>
specification	B-Application
which	O
provided	O
a	O
means	O
of	O
sending	O
,	O
subscribing	O
and	O
receiving	O
messages	O
.	O
</s>
<s>
OSIDs	B-Architecture
were	O
programmatic	O
interfaces	O
which	O
comprised	O
a	O
Service	O
Oriented	O
Architecture	O
for	O
designing	O
and	O
building	O
reusable	B-Application
and	O
interoperable	O
software	O
.	O
</s>
<s>
Messages	O
could	O
be	O
sent	O
to	O
a	O
specific	O
subset	O
of	O
subscribers	O
(	O
Agents	B-Architecture
)	O
or	O
to	O
all	O
subscribers	O
.	O
</s>
<s>
This	O
OSID	B-Architecture
was	O
a	O
general	O
service	O
intended	O
to	O
interface	O
with	O
underlying	O
email	O
,	O
chat	B-Protocol
,	O
instant	B-Application
messaging	I-Application
,	O
or	O
threaded	B-Application
discussion	I-Application
systems	O
.	O
</s>
