<s>
Haystack	B-Application
is	O
a	O
project	O
at	O
the	O
Massachusetts	O
Institute	O
of	O
Technology	O
to	O
research	O
and	O
develop	O
several	O
applications	B-Application
around	O
personal	B-Application
information	I-Application
management	I-Application
and	O
the	O
Semantic	O
Web	O
.	O
</s>
<s>
The	O
most	O
notable	O
of	O
those	O
applications	B-Application
is	O
the	O
Haystack	B-Application
client	O
,	O
a	O
research	O
personal	O
information	O
manager	O
(	O
PIM	O
)	O
and	O
one	O
of	O
the	O
first	O
to	O
be	O
based	O
on	O
semantic	B-Application
desktop	I-Application
technologies	O
.	O
</s>
<s>
The	O
Haystack	B-Application
client	O
is	O
published	O
as	O
open	B-Application
source	I-Application
software	I-Application
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
Similar	O
to	O
the	O
Chandler	B-Language
PIM	O
,	O
the	O
Haystack	B-Application
system	O
unifies	O
handling	O
different	O
types	O
of	O
unstructured	B-Application
information	I-Application
.	O
</s>
<s>
Haystack	B-Application
was	O
developed	O
in	O
the	O
RDF-aware	O
dynamic	O
language	O
Adenine	O
which	O
was	O
created	O
for	O
the	O
project	O
.	O
</s>
<s>
The	O
language	O
was	O
named	O
after	O
the	O
nucleobase	O
adenine	O
and	O
is	O
a	O
scripting	B-Language
language	I-Language
that	O
is	O
cross-platform	B-Operating_System
.	O
</s>
<s>
The	O
language	O
constructs	O
of	O
Adenine	O
are	O
derived	O
from	O
Python	B-Language
and	O
Lisp	B-Language
.	O
</s>
