<s>
IBM	B-Application
SystemT	I-Application
is	O
a	O
declarative	O
information	B-General_Concept
extraction	I-General_Concept
system	O
.	O
</s>
<s>
Its	O
name	O
is	O
partially	O
inspired	O
by	O
System	B-Application
R	I-Application
,	O
a	O
seminal	O
project	O
from	O
the	O
same	O
research	O
center	O
.	O
</s>
<s>
SystemT	B-Application
comprises	O
the	O
following	O
three	O
main	O
components	O
:	O
(	O
1	O
)	O
AQL	O
,	O
a	O
declarative	O
rule	O
language	O
with	O
a	O
similar	O
syntax	O
to	O
SQL	O
;	O
(	O
2	O
)	O
Optimizer	O
,	O
which	O
accepts	O
AQL	O
statements	O
as	O
input	O
and	O
generates	O
high-performance	O
algebraic	O
execution	O
plans	O
;	O
and	O
(	O
3	O
)	O
Executing	O
engine	O
,	O
which	O
executes	O
the	O
plan	O
generated	O
by	O
the	O
Optimizer	O
and	O
performs	O
information	B-General_Concept
extraction	I-General_Concept
over	O
input	O
documents	O
.	O
</s>
<s>
SystemT	B-Application
is	O
available	O
as	O
part	O
of	O
IBM	O
BigInsights	O
,	O
and	O
has	O
also	O
been	O
taught	O
in	O
multiple	O
universities	O
around	O
the	O
globe	O
.	O
</s>
<s>
A	O
version	O
of	O
SystemT	B-Application
was	O
available	O
(	O
starting	O
in	O
September	O
2016	O
)	O
as	O
a	O
companion	O
to	O
a	O
sequence	O
of	O
online	O
courses	O
in	O
Text	B-Algorithm
Analytics	I-Algorithm
.	O
</s>
