<s>
XML-Data	B-Language
Reduced	I-Language
(	O
XDR	B-Protocol
)	O
is	O
a	O
discontinued	O
schema	O
language	O
for	O
specifying	O
and	O
validating	O
XML	B-Protocol
documents	I-Protocol
.	O
</s>
<s>
In	O
January	O
1998	O
,	O
Microsoft	O
,	O
the	O
University	O
of	O
Edinburgh	O
and	O
others	O
submitted	O
a	O
proposal	O
for	O
an	O
XML	B-Protocol
schema	O
language	O
called	O
XML-Data	B-Language
to	O
the	O
World	O
Wide	O
Web	O
Consortium	O
.	O
</s>
<s>
XML-Data	B-Language
Reduced	I-Language
was	O
a	O
subset	O
of	O
XML-Data	B-Language
,	O
with	O
some	O
corrections	O
and	O
amendments	O
submitted	O
in	O
July	O
1998	O
.	O
</s>
<s>
The	O
XML	B-Protocol
Schema	O
effort	O
in	O
the	O
World	O
Wide	O
Web	O
Consortium	O
(	O
W3C	O
)	O
received	O
several	O
other	O
proposals	O
,	O
and	O
while	O
the	O
final	O
result	O
has	O
some	O
similarities	O
to	O
the	O
XML-Data	B-Language
proposal	O
,	O
it	O
is	O
significantly	O
different	O
.	O
</s>
<s>
XDR	B-Protocol
was	O
implemented	O
in	O
SQL	O
Server	O
2000	O
and	O
BizTalk	B-Application
Server	I-Application
2000	O
.	O
</s>
<s>
Once	O
the	O
XML	B-Protocol
Schema	O
Definition	O
was	O
finalized	O
in	O
2001	O
,	O
Microsoft	O
products	O
and	O
tools	O
added	O
support	O
for	O
it	O
,	O
and	O
XDR	B-Protocol
was	O
gradually	O
phased	O
out	O
.	O
</s>
<s>
Microsoft	B-Application
XML	I-Application
Core	I-Application
Services	I-Application
provided	O
XDR	B-Language
schema	I-Language
support	O
from	O
versions	O
2.0	O
up	O
to	O
—	O
but	O
not	O
including	O
—	O
version	O
6.0	O
.	O
</s>
