<s>
The	O
Logic	B-Application
File	I-Application
System	I-Application
is	O
a	O
research	O
file	O
system	O
which	O
replaces	O
pathnames	O
with	O
expressions	O
in	O
propositional	O
logic	O
.	O
</s>
<s>
It	O
allows	O
file	O
metadata	O
to	O
be	O
queried	O
with	O
a	O
superset	O
of	O
the	O
Boolean	O
syntax	O
commonly	O
used	O
in	O
modern	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
The	O
actual	O
name	O
is	O
the	O
Logic	O
Information	O
Systems	O
File	O
System	O
,	O
and	O
is	O
abbreviated	O
LISFS	O
to	O
avoid	O
confusion	O
with	O
the	O
log-structured	B-Application
file	I-Application
system	I-Application
(	O
LFS	O
)	O
.	O
</s>
<s>
An	O
implementation	O
of	O
the	O
Logic	B-Application
File	I-Application
System	I-Application
is	O
available	O
at	O
the	O
LISFS	O
website	O
.	O
</s>
<s>
It	O
is	O
intended	O
to	O
be	O
used	O
on	O
Unix-like	O
operating	O
systems	O
and	O
is	O
a	O
bit	O
difficult	O
to	O
install	O
,	O
as	O
it	O
needs	O
several	O
non-standard	O
OCaml	B-Language
modules	O
.	O
</s>
