<s>
A	O
Functional	B-Protocol
Presence	I-Protocol
Engine	I-Protocol
,	O
or	O
FPE	O
,	O
is	O
a	O
probabilistic	B-General_Concept
parsing	I-General_Concept
mechanism	O
that	O
uses	O
at	O
least	O
four	O
components	O
to	O
respond	O
to	O
input	O
patterns	O
.	O
</s>
<s>
It	O
comprises	O
a	O
lexing	B-Application
system	O
,	O
a	O
probabilistic	O
fitness	O
function	O
,	O
a	O
knowledge	O
base	O
,	O
and	O
a	O
library	O
of	O
functions	O
that	O
the	O
knowledge	O
base	O
can	O
trigger	O
.	O
</s>
<s>
The	O
lexing	B-Application
system	O
accepts	O
and	O
parses	O
inputs	O
and	O
or	O
query	O
patterns	O
.	O
</s>
<s>
A	O
Functional	B-Protocol
Presence	I-Protocol
Engines	I-Protocol
is	O
,	O
subsequently	O
,	O
a	O
stimulus-response	O
mechanism	O
that	O
allows	O
for	O
a	O
higher	O
variability	O
of	O
inputs	O
to	O
elicit	O
response	O
patterns	O
with	O
a	O
high	O
likelihood	O
of	O
correctness	O
,	O
even	O
from	O
incomplete	O
training	O
.	O
</s>
<s>
The	O
system	O
predates	O
SIRI	B-Application
by	O
six	O
years	O
.	O
</s>
<s>
Such	O
systems	O
allow	O
conversational	B-Protocol
AI	I-Protocol
and	O
virtual	B-Protocol
assistant	I-Protocol
platforms	O
to	O
respond	O
correctly	O
to	O
new	O
inputs	O
outside	O
their	O
training	O
sets	O
–	O
The	O
US	O
Army	O
's	O
Sgt	O
Star	O
being	O
a	O
prime	O
example	O
.	O
</s>
<s>
The	O
first	O
Functional	B-Protocol
Presence	I-Protocol
Engine	I-Protocol
was	O
deployed	O
in	O
2001	O
by	O
Spectre	O
AI	O
Incorporated	O
.	O
</s>
<s>
The	O
development	O
of	O
the	O
FPE	O
also	O
resulted	O
in	O
an	O
obscure	O
markup	O
language	O
that	O
the	O
company	O
referred	O
to	O
as	O
FPML	O
(	O
Functional	O
Presence	O
Markup	O
Language	O
)	O
,	O
which	O
was	O
based	O
largely	O
on	O
AIML	B-Application
(	O
Artificial	B-Application
Intelligence	I-Application
Markup	I-Application
Language	I-Application
)	O
.	O
</s>
