<s>
TreeLine	B-Application
is	O
a	O
free	B-Application
and	O
simple	O
outliner	B-Application
with	O
advanced	O
data	O
element	O
definition	O
and	O
export	O
abilities	O
.	O
</s>
<s>
It	O
uses	O
a	O
basic	O
tree	B-Application
structure	I-Application
to	O
organize	O
information	O
,	O
and	O
allows	O
the	O
user	O
to	O
define	O
different	O
types	O
of	O
nodes	O
and	O
leaves	O
.	O
</s>
<s>
TreeLine	B-Application
outlines	O
can	O
be	O
exported	O
as	O
HTML	O
,	O
per-data	O
type	O
user	O
defined	O
formatting	O
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
supports	O
exporting	O
outlines	O
as	O
an	O
OpenDocument	B-Application
ODT	I-Application
file	O
,	O
OPML	B-Application
,	O
various	O
delimited	O
text	O
file	O
formats	O
,	O
and	O
as	O
"	O
plain	O
"	O
XML	O
.	O
</s>
<s>
TreeLine	B-Application
can	O
open	O
"	O
plain	O
"	O
XML	O
files	O
,	O
displaying	O
the	O
contents	O
as	O
an	O
outline	O
.	O
</s>
<s>
TreeLine	B-Application
uses	O
a	O
simple	O
XML	O
syntax	O
to	O
store	O
data	O
,	O
with	O
a	O
.trl	O
extension	O
.	O
</s>
