<s>
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Architecture	I-Operating_System
(	O
OGSA	B-Operating_System
)	O
describes	O
a	O
service-oriented	O
architecture	O
for	O
a	O
grid	B-Architecture
computing	I-Architecture
environment	O
for	O
business	O
and	O
scientific	O
use	O
.	O
</s>
<s>
OGSA	B-Operating_System
is	O
a	O
distributed	O
interaction	O
and	O
computing	O
architecture	O
based	O
around	O
services	O
,	O
assuring	O
interoperability	O
on	O
heterogeneous	O
systems	O
so	O
that	O
different	O
types	O
of	O
resources	O
can	O
communicate	O
and	O
share	O
information	O
.	O
</s>
<s>
OGSA	B-Operating_System
is	O
based	O
on	O
several	O
other	O
Web	O
service	O
technologies	O
,	O
such	O
as	O
the	O
Web	O
Services	O
Description	O
Language	O
(	O
WSDL	O
)	O
and	O
the	O
Simple	B-Protocol
Object	I-Protocol
Access	I-Protocol
Protocol	I-Protocol
(	O
SOAP	B-Protocol
)	O
,	O
but	O
it	O
aims	O
to	O
be	O
largely	O
independent	O
of	O
transport-level	O
handling	O
of	O
data	O
.	O
</s>
<s>
OGSA	B-Operating_System
has	O
been	O
described	O
as	O
a	O
refinement	O
of	O
a	O
Web	O
services	O
architecture	O
,	O
specifically	O
designed	O
to	O
support	O
grid	O
requirements	O
.	O
</s>
<s>
The	O
concept	O
of	O
OGSA	B-Operating_System
is	O
derived	O
from	O
work	O
presented	O
in	O
the	O
2002	O
Globus	O
Alliance	O
paper	O
"	O
The	O
Physiology	O
of	O
the	O
Grid	O
"	O
by	O
Ian	O
Foster	O
,	O
Carl	O
Kesselman	O
,	O
Jeffrey	O
M	O
.	O
Nick	O
,	O
and	O
Steven	O
Tuecke	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
GGF	O
working	O
groups	O
which	O
resulted	O
in	O
a	O
document	O
,	O
entitled	O
The	O
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Architecture	I-Operating_System
,	O
Version	O
1.5	O
in	O
2006	O
.	O
</s>
<s>
According	O
to	O
the	O
"	O
Defining	O
the	O
Grid	O
:	O
A	O
Roadmap	O
for	O
OGSA	B-Operating_System
Standards	O
v	O
1.0	O
"	O
,	O
OGSA	B-Operating_System
is	O
:	O
</s>
<s>
An	O
architectural	O
process	O
in	O
which	O
the	O
GGF	O
's	O
OGSA	B-Operating_System
Working	O
Group	O
collects	O
requirements	O
and	O
maintains	O
a	O
set	O
of	O
informational	O
documents	O
that	O
describe	O
the	O
architecture	O
;	O
</s>
<s>
Software	O
components	O
that	O
adhere	O
to	O
the	O
OGSA	B-Operating_System
specifications	O
and	O
profiles	O
,	O
enabling	O
deployment	O
of	O
grid	O
solutions	O
that	O
are	O
interoperable	O
even	O
though	O
they	O
may	O
be	O
based	O
on	O
implementations	O
from	O
multiple	O
sources	O
.	O
</s>
<s>
The	O
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Architecture	I-Operating_System
,	O
Version	O
1.5	O
described	O
these	O
capabilities	O
:	O
</s>
<s>
In	O
late	O
2006	O
an	O
updated	O
version	O
of	O
OGSA	B-Operating_System
and	O
several	O
associated	O
documents	O
were	O
published	O
,	O
including	O
the	O
first	O
of	O
several	O
planned	O
normative	O
documents	O
,	O
"	O
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Architecture	I-Operating_System
Glossary	O
of	O
Terms	O
,	O
Version	O
1.5	O
"	O
.	O
</s>
<s>
The	O
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Infrastructure	I-Operating_System
(	O
OGSI	B-Operating_System
)	O
is	O
related	O
to	O
OGSA	B-Operating_System
,	O
as	O
it	O
was	O
originally	O
intended	O
to	O
form	O
the	O
basic	O
“	O
plumbing	O
”	O
layer	O
for	O
OGSA	B-Operating_System
.	O
</s>
