<s>
UMLet	B-Application
is	O
an	O
open-source	B-License
Java-based	O
UML	B-Application
tool	I-Application
designed	O
for	O
teaching	O
the	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
and	O
for	O
quickly	O
creating	O
UML	B-Language
diagrams	I-Language
.	O
</s>
<s>
UMLet	B-Application
is	O
distributed	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
UMLet	B-Application
has	O
a	O
simple	O
user	O
interface	O
that	O
uses	O
text-formatting	O
codes	O
to	O
modify	O
the	O
basic	O
shapes	O
with	O
decorations	O
and	O
annotations	O
,	O
so	O
there	O
is	O
no	O
forest	O
of	O
icons	O
or	O
parameter	O
list	O
dialogs	O
in	O
the	O
user	O
's	O
way	O
.	O
</s>
<s>
This	O
does	O
require	O
the	O
user	O
to	O
learn	O
yet	O
another	O
text	O
markup	O
language	O
,	O
but	O
the	O
effort	O
is	O
small	O
and	O
the	O
markup	O
obvious	O
to	O
the	O
experienced	O
UML	B-Language
designer	O
.	O
</s>
<s>
UMLet	B-Application
can	O
export	O
diagrams	O
to	O
pictures	O
(	O
eps	O
,	O
jpg	O
)	O
,	O
drawing	O
formats	O
(	O
SVG	B-Application
)	O
,	O
document	O
formats	O
(	O
PDF	B-Application
)	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
create	O
custom	O
UML	B-Language
elements	O
.	O
</s>
<s>
This	O
requires	O
programming	O
of	O
the	O
elements	O
in	O
Java	B-Language
.	O
</s>
<s>
The	O
most	O
important	O
UML	B-Language
diagram	I-Language
types	O
are	O
supported	O
:	O
class	O
,	O
use	O
case	O
,	O
sequence	O
,	O
state	O
,	O
deployment	O
,	O
activity	O
.	O
</s>
<s>
Its	O
design	O
goals	O
are	O
described	O
in	O
the	O
paper	O
"	O
Flyweight	O
UML	B-Language
Modelling	O
Tool	O
for	O
Software	O
Development	O
"	O
.	O
</s>
<s>
Another	O
paper	O
compares	O
UMLet	B-Application
to	O
Rational	B-Application
Rose	I-Application
.	O
</s>
<s>
The	O
app	O
's	O
native	O
file	O
format	O
is	O
UXF	B-Language
,	O
an	O
extension	O
of	O
XML	O
intended	O
for	O
exchanging	O
UML	B-Language
models	O
.	O
</s>
<s>
UMLet	B-Application
runs	O
stand-alone	O
or	O
as	O
Eclipse	B-Application
plug-in	O
on	O
Windows	B-Application
,	O
OS	B-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
