<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
was	O
published	O
by	O
the	O
Global	O
Grid	O
Forum	O
(	O
GGF	O
)	O
as	O
a	O
proposed	O
recommendation	O
in	O
June	O
2003	O
.	O
</s>
<s>
It	O
was	O
intended	O
to	O
provide	O
an	O
infrastructure	O
layer	O
for	O
the	O
Open	B-Operating_System
Grid	I-Operating_System
Services	I-Operating_System
Architecture	I-Operating_System
(	O
OGSA	B-Operating_System
)	O
.	O
</s>
<s>
OGSI	B-Operating_System
takes	O
the	O
statelessness	O
issues	O
(	O
along	O
with	O
others	O
)	O
into	O
account	O
by	O
essentially	O
extending	O
Web	O
services	O
to	O
accommodate	O
grid	B-Architecture
computing	I-Architecture
resources	O
that	O
are	O
both	O
transient	O
and	O
stateful	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
GT4	O
,	O
the	O
open	O
source	O
tool	O
kit	O
is	O
migrating	O
back	O
to	O
a	O
pure	O
Web	O
services	O
implementation	O
(	O
rather	O
than	O
OGSI	B-Operating_System
)	O
,	O
via	O
integration	O
of	O
the	O
WSRF	O
.	O
</s>
<s>
"	O
OGSI	B-Operating_System
,	O
which	O
was	O
the	O
former	O
set	O
of	O
extensions	O
to	O
Web	O
services	O
to	O
provide	O
stateful	O
interactions	O
--	O
I	O
would	O
say	O
at	O
this	O
point	O
is	O
obsolete	O
,	O
"	O
Jay	O
Unger	O
said	O
.	O
</s>
<s>
But	O
OGSA	B-Operating_System
,	O
which	O
focuses	O
on	O
specific	O
service	O
definition	O
in	O
the	O
areas	O
of	O
execution	O
components	O
,	O
execution	O
modeling	O
,	O
grid	O
data	O
components	O
,	O
and	O
information	O
virtualization	O
,	O
still	O
has	O
an	O
important	O
role	O
to	O
play	O
in	O
the	O
evolution	O
of	O
standards	O
and	O
open	O
source	O
tool	O
kits	O
like	O
Globus.	O
"	O
</s>
<s>
Globus	O
Toolkit	O
version	O
3	O
contains	O
an	O
implementation	O
of	O
OGSI	B-Operating_System
.	O
</s>
