<s>
Linguistic	B-Language
Knowledge	I-Language
Builder	I-Language
(	O
LKB	B-Language
)	O
is	O
a	O
free	B-Application
and	O
open	B-Application
source	I-Application
grammar	O
engineering	O
environment	O
for	O
creating	O
grammars	O
and	O
lexicons	O
of	O
natural	O
languages	O
.	O
</s>
<s>
Any	O
unification-based	O
grammar	O
can	O
be	O
implemented	O
,	O
but	O
LKB	B-Language
is	O
typically	O
used	O
for	O
grammars	O
with	O
typed	O
feature	O
structures	O
such	O
as	O
HPSG	O
.	O
</s>
<s>
LKB	B-Language
is	O
free	B-Application
software	I-Application
under	O
the	B-License
MIT	I-License
license	I-License
.	O
</s>
<s>
It	O
is	O
implemented	O
in	O
Common	B-Language
Lisp	I-Language
,	O
and	O
constitutes	O
one	O
core	O
component	O
of	O
the	O
DELPH-IN	O
collaboration	O
.	O
</s>
