<s>
Real-time	B-Language
Programming	I-Language
Language	I-Language
(	O
RPL	O
)	O
is	O
a	O
compiled	O
database	O
programming	O
language	O
used	O
on	O
CMC/Microdata/McDonnell	O
Douglas	O
REALITY	O
databases	O
,	O
derived	O
and	O
expanded	O
from	O
the	O
PROC	O
procedure	O
language	O
,	O
with	O
much	O
extra	O
functionality	O
added	O
.	O
</s>
<s>
A	O
number	O
of	O
large	O
scale	O
manufacturing	O
applications	O
were	O
developed	O
in	O
RPL	O
,	O
including	O
that	O
which	O
was	O
in	O
use	O
at	O
Plessey	O
and	O
GEC-Plessey	O
Telecommunications	O
limited	O
in	O
Liverpool	B-Application
and	O
also	O
the	O
Trifid	O
suite	O
of	O
manufacturing	O
software	O
.	O
</s>
