<s>
DATR	B-General_Concept
is	O
a	O
language	O
for	O
lexical	B-Application
knowledge	O
representation	O
.	O
</s>
<s>
The	O
lexical	B-Application
knowledge	O
is	O
encoded	O
in	O
a	O
network	O
of	O
nodes	O
.	O
</s>
<s>
DATR	B-General_Concept
was	O
developed	O
in	O
the	O
late	O
1980s	O
by	O
Roger	O
Evans	O
,	O
Gerald	O
Gazdar	O
and	O
Bill	O
Keller	O
,	O
and	O
used	O
extensively	O
in	O
the	O
1990s	O
;	O
the	O
standard	O
specification	O
is	O
contained	O
in	O
the	O
Evans	O
and	O
Gazdar	O
RFC	O
,	O
available	O
on	O
the	O
Sussex	O
website	O
(	O
below	O
)	O
.	O
</s>
<s>
DATR	B-General_Concept
has	O
been	O
implemented	O
in	O
a	O
variety	O
of	O
programming	O
languages	O
,	O
and	O
several	O
implementations	O
are	O
available	O
on	O
the	O
internet	O
,	O
including	O
an	O
RFC	O
compliant	O
implementation	O
at	O
the	O
Bielefeld	O
website	O
(	O
below	O
)	O
.	O
</s>
<s>
DATR	B-General_Concept
is	O
still	O
used	O
for	O
encoding	O
inheritance	O
networks	O
in	O
various	O
linguistic	O
and	O
non-linguistic	O
domains	O
and	O
is	O
under	O
discussion	O
as	O
a	O
standard	O
notation	O
for	O
the	O
representation	O
of	O
lexical	B-Application
information	O
.	O
</s>
