<s>
Esper	B-Language
is	O
an	O
open-source	B-Application
Java-based	O
software	O
product	O
for	O
Complex	B-Operating_System
event	I-Operating_System
processing	I-Operating_System
(	O
CEP	O
)	O
and	O
Event	B-Application
stream	I-Application
processing	I-Application
(	O
ESP	O
)	O
,	O
that	O
analyzes	O
series	O
of	O
events	O
for	O
deriving	O
conclusions	O
from	O
them	O
.	O
</s>
<s>
Esper	B-Language
extends	O
the	O
SQL-92	B-Language
standard	O
for	O
its	O
engine	O
and	O
enterprise	O
framework	O
,	O
providing	O
Aggregate	O
function	O
,	O
Pattern	B-Language
matching	I-Language
,	O
event	O
windowing	O
and	O
joining	O
.	O
</s>
<s>
Esper	B-Language
implements	O
Event-driven	B-Application
programming	I-Application
and	O
event-driven	B-Application
architecture	I-Application
.	O
</s>
<s>
Esper	B-Language
was	O
created	O
in	O
2006	O
by	O
EsperTech	O
Inc	O
.	O
</s>
<s>
It	O
offers	O
a	O
Domain-specific	B-Language
language	I-Language
for	O
processing	O
events	O
called	O
Event	B-Operating_System
Processing	I-Operating_System
Language	O
(	O
EPL	O
)	O
.	O
</s>
<s>
EPL	O
is	O
a	O
Declarative	B-Language
programming	I-Language
language	I-Language
for	O
analyzing	O
time-based	O
event	O
data	O
and	O
detecting	O
situations	O
as	O
they	O
occur	O
.	O
</s>
<s>
Esper	B-Language
is	O
a	O
Java-based	O
application	O
but	O
has	O
been	O
ported	O
to	O
the	O
C#	B-Application
programming	O
language	O
and	O
is	O
available	O
for	O
the	O
.NET	B-Application
Framework	I-Application
under	O
the	O
name	O
NEsper	O
.	O
</s>
<s>
EsperTech	O
Inc	O
.	O
provides	O
Esper	B-Language
Enterprise	O
Edition	O
with	O
enterprise-ability	O
features	O
.	O
</s>
<s>
StreamSQL	B-Language
:	O
StreamSQL	B-Language
is	O
a	O
query	O
language	O
that	O
extends	O
SQL	O
with	O
the	O
ability	O
to	O
process	O
real-time	O
data	O
streams	O
.	O
</s>
