<s>
XBlock	B-Protocol
is	O
the	O
SDK	B-Application
for	O
the	O
edX	B-Application
MOOC	O
platform	O
,	O
written	O
in	O
Python	B-Language
,	O
and	O
announced	O
and	O
released	O
publicly	O
on	O
March	O
14	O
,	O
2013	O
.	O
</s>
<s>
It	O
aims	O
to	O
enable	O
the	O
global	O
software	O
development	O
community	O
to	O
participate	O
in	O
the	O
construction	O
of	O
the	O
edX	B-Application
educational	O
platform	O
and	O
the	O
next	O
generation	O
of	O
online	O
and	O
blended	O
courses	O
.	O
</s>
