<s>
The	O
Production	B-Language
Rule	I-Language
Representation	I-Language
(	O
PRR	O
)	O
is	O
a	O
proposed	O
standard	O
of	O
the	O
Object	B-Architecture
Management	I-Architecture
Group	I-Architecture
(	O
OMG	O
)	O
to	O
provide	O
a	O
vendor-neutral	O
rule-model	O
representation	O
in	O
UML	B-Language
for	O
production	O
rules	O
as	O
used	O
in	O
forward-chaining	O
rule	O
engines	O
.	O
</s>
<s>
The	O
OMG	O
set	O
up	O
a	O
Business	O
Rules	O
Working	O
Group	O
in	O
2002	O
as	O
the	O
first	O
standards	O
body	O
to	O
recognize	O
the	O
importance	O
of	O
the	O
"	O
Business	B-Application
Rules	I-Application
Approach	I-Application
"	O
.	O
</s>
<s>
It	O
issued	O
2	O
main	O
RFPs	O
in	O
2003	O
a	O
standard	O
for	O
modeling	O
production	O
rules	O
(	O
PRR	O
)	O
,	O
and	O
a	O
standard	O
for	O
modeling	O
business	O
rules	O
as	O
business	O
documentation	O
(	O
BSBR	O
,	O
now	O
SBVR	B-Application
)	O
.	O
</s>
<s>
Contributors	O
have	O
included	O
all	O
the	O
major	O
BRE	O
vendors	O
,	O
members	O
of	O
RuleML	B-Language
,	O
and	O
leading	O
UML	B-Language
vendors	O
.	O
</s>
<s>
The	O
PRR	O
RFP	O
originally	O
suggested	O
that	O
PRR	O
use	O
a	O
combination	O
of	O
UML	B-Language
OCL	B-Language
and	O
Action	O
Semantics	O
for	O
rule	O
conditions	O
and	O
actions	O
.	O
</s>
<s>
However	O
,	O
expecting	O
modellers	O
to	O
learn	O
2	O
relatively	O
obscure	O
UML	B-Language
languages	O
in	O
order	O
to	O
define	O
a	O
production	O
rule	O
proved	O
unpalatable	O
.	O
</s>
<s>
Therefore	O
PRR	O
OCL	B-Language
was	O
defined	O
that	O
included	O
OCL	B-Language
extensions	O
for	O
simple	O
rule	O
actions	O
(	O
as	O
well	O
as	O
external	O
functions	O
)	O
.	O
</s>
<s>
PRR	O
OCL	B-Language
is	O
currently	O
considered	O
"	O
non-normative	O
"	O
i.e.	O
</s>
