<s>
Open	B-Architecture
service	I-Architecture
interface	I-Architecture
definitions	I-Architecture
(	O
OSIDs	B-Architecture
)	O
are	O
programmatic	O
interface	O
specifications	O
describing	O
services	O
.	O
</s>
<s>
While	O
some	O
methods	O
define	O
the	O
service	O
interface	O
boundary	O
at	O
a	O
protocol	O
or	O
server	O
level	O
,	O
OSIDs	B-Architecture
place	O
the	O
boundary	O
at	O
the	O
application	O
level	O
to	O
effectively	O
insulate	O
the	O
consumer	O
from	O
protocols	O
,	O
server	O
identities	O
,	O
and	O
utility	O
libraries	O
that	O
are	O
in	O
the	O
domain	O
to	O
a	O
service	O
provider	O
resulting	O
in	O
software	O
which	O
is	O
easier	O
to	O
develop	O
,	O
longer-lasting	O
,	O
and	O
usable	O
across	O
a	O
wider	O
array	O
of	O
computing	O
environments	O
.	O
</s>
<s>
OSIDs	B-Architecture
assist	O
in	O
software	O
design	O
and	O
development	O
by	O
breaking	O
up	O
the	O
problem	O
space	O
across	O
service	O
interface	O
boundaries	O
.	O
</s>
<s>
OSIDs	B-Architecture
are	O
also	O
used	O
for	O
communication	O
and	O
coordination	O
among	O
the	O
various	O
components	O
of	O
complex	O
software	O
which	O
provide	O
a	O
means	O
of	O
organizing	O
design	O
and	O
development	O
activities	O
for	O
simplified	O
project	O
management	O
.	O
</s>
<s>
OSID	B-Architecture
providers	O
(	O
implementations	O
)	O
are	O
often	O
reused	O
across	O
a	O
varied	O
set	O
of	O
applications	O
.	O
</s>
<s>
This	O
achieves	O
reusability	B-Application
at	O
a	O
high	O
level	O
(	O
a	O
service	O
level	O
)	O
and	O
also	O
serves	O
to	O
easily	O
scale	O
software	O
written	O
for	O
smaller	O
more	O
dedicated	O
purposes	O
.	O
</s>
<s>
An	O
OSID	B-Architecture
provider	O
implementation	O
may	O
be	O
composed	O
of	O
an	O
arbitrary	O
number	O
of	O
other	O
OSID	B-Architecture
providers	O
.	O
</s>
<s>
This	O
layering	O
technique	O
is	O
an	O
obvious	O
means	O
of	O
abstraction	B-Application
.	O
</s>
<s>
When	O
all	O
the	O
OSID	B-Architecture
providers	O
implement	O
the	O
same	O
service	O
,	O
this	O
is	O
called	O
an	O
adapter	O
pattern	O
.	O
</s>
