<s>
AllegroGraph	B-Language
is	O
a	O
closed	B-Application
source	I-Application
triplestore	O
which	O
is	O
designed	O
to	O
store	O
RDF	O
triples	O
,	O
a	O
standard	O
format	O
for	O
Linked	B-Operating_System
Data	I-Operating_System
.	O
</s>
<s>
It	O
also	O
operates	O
as	O
a	O
document	B-General_Concept
store	I-General_Concept
designed	O
for	O
storing	O
,	O
retrieving	O
and	O
managing	O
document-oriented	O
information	O
,	O
in	O
JSON-LD	B-Protocol
format	O
.	O
</s>
<s>
AllegroGraph	B-Language
is	O
currently	O
in	O
use	O
in	O
commercial	O
projects	O
and	O
a	O
US	O
Department	O
of	O
Defense	O
project	O
.	O
</s>
<s>
It	O
is	O
also	O
the	O
storage	O
component	O
for	O
the	O
TwitLogic	O
project	O
that	O
is	O
bringing	O
the	O
Semantic	O
Web	O
to	O
Twitter	B-Application
data	O
.	O
</s>
<s>
AllegroGraph	B-Language
was	O
developed	O
to	O
meet	O
W3C	O
standards	O
for	O
the	O
Resource	O
Description	O
Framework	O
,	O
so	O
it	O
is	O
properly	O
considered	O
an	O
RDF	O
Database	O
.	O
</s>
<s>
It	O
is	O
a	O
reference	O
implementation	O
for	O
the	O
SPARQL	B-Language
protocol	O
.	O
</s>
<s>
SPARQL	B-Language
is	O
a	O
standard	O
query	O
language	O
for	O
linked	B-Operating_System
data	I-Operating_System
,	O
serving	O
the	O
same	O
purposes	O
for	O
RDF	O
databases	O
that	O
SQL	B-Language
serves	O
for	O
relational	O
databases	O
.	O
</s>
<s>
Franz	O
Inc	O
.	O
is	O
the	O
developer	O
of	O
AllegroGraph	B-Language
.	O
</s>
<s>
It	O
also	O
develops	O
Allegro	B-Language
Common	I-Language
Lisp	I-Language
,	O
an	O
implementation	O
of	O
Common	B-Language
Lisp	I-Language
,	O
a	O
dialect	O
of	O
Lisp	B-Language
(	O
programming	O
language	O
)	O
.	O
</s>
<s>
The	O
functionality	O
of	O
AllegroGraph	B-Language
is	O
made	O
available	O
through	O
Java	B-Language
,	O
Python	B-Language
,	O
Common	B-Language
Lisp	I-Language
and	O
other	O
APIs	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
AllegroGraph	B-Language
was	O
made	O
available	O
at	O
the	O
end	O
of	O
2004	O
.	O
</s>
<s>
AllegroGraph	B-Language
has	O
client	O
interfaces	O
for	O
Java	B-Language
,	O
Python	B-Language
,	O
Ruby	B-Language
,	O
Perl	B-Language
,	O
C#	B-Application
,	O
Clojure	B-Language
,	O
and	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
The	O
product	O
is	O
available	O
for	O
Windows	O
,	O
Linux	B-Application
,	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
platforms	O
,	O
supporting	O
32	O
or	O
64	O
bits	O
.	O
</s>
<s>
AllegroGraph	B-Language
includes	O
an	O
implementation	O
of	O
Prolog	B-Language
based	O
on	O
the	O
implementation	O
developed	O
by	O
Peter	O
Norvig	O
in	O
Paradigms	O
of	O
Artificial	O
Intelligence	O
Programming	O
.	O
</s>
