<s>
Prova	B-Language
is	O
an	O
open	B-License
source	I-License
programming	O
language	O
that	O
combines	O
Prolog	B-Language
with	O
Java	B-Language
.	O
</s>
<s>
Prova	B-Language
is	O
a	O
rule-based	O
scripting	B-Language
system	O
that	O
is	O
used	O
for	O
middleware	B-General_Concept
.	O
</s>
<s>
The	O
language	O
combines	O
imperative	B-Application
and	O
declarative	B-Language
programming	I-Language
by	O
using	O
a	O
prolog	B-Language
syntax	B-Application
that	O
allows	O
calls	O
to	O
Java	B-Language
functions	O
.	O
</s>
<s>
In	O
this	O
way	O
a	O
strong	O
Java	B-Language
code	I-Language
base	O
is	O
combined	O
with	O
Prolog	B-Language
features	O
such	O
as	O
backtracking	O
.	O
</s>
<s>
Prova	B-Language
is	O
derived	O
from	O
Mandarax	O
,	O
a	O
Java-based	O
inference	O
system	O
developed	O
by	O
Jens	O
Dietrich	O
.	O
</s>
<s>
Prova	B-Language
extends	O
Mandarax	O
by	O
providing	O
a	O
proper	O
language	O
syntax	B-Application
,	O
native	O
syntax	B-Application
integration	O
with	O
Java	B-Language
,	O
agent	O
messaging	O
and	O
reaction	O
rules	O
.	O
</s>
<s>
In	O
the	O
project	O
,	O
the	O
language	O
is	O
used	O
as	O
a	O
rule-based	O
backbone	O
for	O
distributed	O
web	B-Application
applications	I-Application
in	O
biomedical	O
data	B-General_Concept
integration	I-General_Concept
,	O
in	O
particular	O
,	O
the	O
GoPubMed	O
system	O
.	O
</s>
<s>
The	O
design	O
goals	O
of	O
Prova	B-Language
:	O
</s>
<s>
Combine	O
declarative	B-Language
and	O
object-oriented	B-Language
programming	I-Language
.	O
</s>
<s>
Access	O
data	O
sources	O
via	O
wrappers	O
written	O
in	O
Java	B-Language
or	O
command-line	B-Application
shells	O
like	O
Perl	B-Language
.	O
</s>
<s>
Make	O
the	O
Java	B-Language
API	O
of	O
various	O
packages	O
accessible	O
as	O
rules	O
.	O
</s>
<s>
Run	O
within	O
the	O
Java	B-Language
runtime	O
.	O
</s>
<s>
Enable	O
rapid	B-Device
prototyping	I-Device
of	O
applications	O
.	O
</s>
<s>
Prova	B-Language
aims	O
to	O
provide	O
support	O
for	O
data	B-General_Concept
integration	I-General_Concept
tasks	O
when	O
the	O
following	O
is	O
important	O
:	O
</s>
<s>
Format	O
transparency	O
(	O
database	O
,	O
RDF	O
,	O
XML	B-Protocol
,	O
HTML	B-Language
,	O
flat	B-Application
files	I-Application
,	O
computation	O
resource	O
)	O
;	O
</s>
<s>
Use	O
of	O
open	O
and	O
open	B-License
source	I-License
technologies	I-License
;	O
</s>
<s>
Prova	B-Language
has	O
been	O
used	O
as	O
the	O
key	O
service	O
integration	O
engine	O
in	O
the	O
Xcalia	O
product	O
where	O
it	O
is	O
used	O
for	O
computing	O
efficient	O
global	O
execution	O
plans	O
across	O
multiple	O
data	O
sources	O
such	O
as	O
Web	O
services	O
,	O
TP	O
monitors	O
transactions	O
like	O
CICS	B-Application
or	O
IMS	B-Application
,	O
messages	O
of	O
MOM	O
like	O
MQ-Series	O
,	O
packaged	O
applications	O
with	O
a	O
JCA	B-Language
connector	I-Language
,	O
legacy	O
data	O
sources	O
on	O
mainframes	O
with	O
a	O
JCA	B-Language
connector	I-Language
,	O
remote	O
EJB	O
Java	B-Language
objects	O
considered	O
as	O
data	O
providers	O
or	O
even	O
local	O
Java	B-Language
objects	O
.	O
</s>
<s>
Prova	B-Language
allows	O
to	O
deliver	O
an	O
innovative	O
software	O
platform	O
for	O
Service-oriented	O
architecture	O
implementations	O
.	O
</s>
