<s>
Prefuse	B-Language
is	O
a	O
Java-based	O
toolkit	B-Library
for	O
building	O
interactive	O
information	B-Application
visualization	I-Application
applications	O
.	O
</s>
<s>
It	O
supports	O
a	O
rich	O
set	O
of	O
features	O
for	O
data	B-Application
modeling	I-Application
,	O
visualization	O
and	O
interaction	O
.	O
</s>
<s>
It	O
provides	O
optimized	O
data	B-General_Concept
structures	I-General_Concept
for	O
tables	B-Application
,	O
graphs	B-Application
,	O
and	O
trees	B-Application
,	O
a	O
host	O
of	O
layout	O
and	O
visual	O
encoding	O
techniques	O
,	O
and	O
support	O
for	O
animation	O
,	O
dynamic	O
queries	B-Language
,	O
integrated	O
search	O
,	O
and	O
database	O
connectivity	O
.	O
</s>
<s>
Prefuse	B-Language
uses	O
the	O
Java	B-Language
2D	I-Language
graphics	B-Library
library	I-Library
,	O
and	O
is	O
easily	O
integrated	O
into	O
Swing	B-Language
applications	O
or	O
Java	B-Application
applets	I-Application
.	O
</s>
<s>
Prefuse	B-Language
is	O
licensed	O
under	O
the	O
terms	O
of	O
a	O
BSD	B-Operating_System
license	I-Operating_System
,	O
and	O
can	O
be	O
used	O
freely	O
for	O
commercial	O
and	O
non-commercial	O
purposes	O
.	O
</s>
<s>
Prefuse	B-Language
is	O
a	O
Java-based	O
extensible	O
software	B-Architecture
framework	I-Architecture
for	O
creating	O
interactive	O
information	B-Application
visualization	I-Application
applications	O
.	O
</s>
<s>
It	O
can	O
be	O
used	O
to	O
build	O
standalone	O
applications	O
,	O
visual	O
components	O
and	O
Java	B-Application
applets	I-Application
.	O
</s>
<s>
Prefuse	B-Language
intends	O
to	O
simplify	O
the	O
processes	O
of	O
visualizing	O
,	O
handling	O
and	O
mapping	O
of	O
data	O
,	O
as	O
well	O
as	O
user	O
interaction	O
.	O
</s>
<s>
Some	O
of	O
Prefuse	B-Language
's	O
features	O
include	O
:	O
</s>
<s>
Table	B-Application
,	O
graph	B-Application
,	O
and	O
tree	B-Application
data	I-Application
structures	I-Application
supporting	O
arbitrary	O
data	O
attributes	O
,	O
data	O
indexing	O
,	O
and	O
selection	O
queries	B-Language
,	O
all	O
with	O
an	O
efficient	O
memory	O
footprint	O
.	O
</s>
<s>
Dynamic	O
queries	B-Language
for	O
interactive	O
filtering	O
of	O
data	O
.	O
</s>
<s>
Integrated	O
text	O
search	O
using	O
a	O
number	O
of	O
available	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
A	O
built	O
in	O
,	O
SQL-like	O
expression	O
language	O
for	O
writing	O
queries	B-Language
to	O
prefuse	B-Language
data	B-General_Concept
structures	I-General_Concept
and	O
creating	O
derived	O
data	O
fields	O
.	O
</s>
<s>
Support	O
for	O
issuing	O
queries	B-Language
to	O
SQL	B-Language
databases	I-Language
and	O
mapping	O
query	O
results	O
into	O
prefuse	B-Language
data	B-General_Concept
structures	I-General_Concept
.	O
</s>
<s>
Simple	O
,	O
developer-friendly	O
application	B-Application
programming	I-Application
interfaces	I-Application
(	O
APIs	B-Application
)	O
for	O
creating	O
custom	O
processing	O
,	O
interaction	O
,	O
and	O
rendering	O
components	O
.	O
</s>
<s>
Prefuse	B-Language
has	O
been	O
used	O
in	O
school	O
course	O
projects	O
,	O
academic	O
and	O
industrial	O
research	O
,	O
and	O
commercial	O
software	O
development	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
prefuse	B-Language
toolkit	B-Library
is	O
based	O
upon	O
the	O
information	B-General_Concept
visualization	I-General_Concept
reference	I-General_Concept
model	I-General_Concept
,	O
a	O
software	O
architecture	O
pattern	O
that	O
breaks	O
up	O
the	O
visualization	O
process	O
into	O
a	O
series	O
of	O
discrete	O
steps	O
.	O
</s>
<s>
"	O
Prefuse	B-Language
:	O
a	O
toolkit	B-Library
for	O
interactive	O
information	B-Application
visualization	I-Application
"	O
provides	O
more	O
details	O
on	O
implementation	O
and	O
evaluation	O
.	O
</s>
<s>
The	O
information	B-General_Concept
visualization	I-General_Concept
reference	I-General_Concept
model	I-General_Concept
was	O
developed	O
in	O
the	O
Ph.D.	O
thesis	O
work	O
of	O
Ed	O
Chi	O
,	O
under	O
the	O
name	O
of	O
the	O
data	O
state	O
model	O
.	O
</s>
<s>
Later	O
,	O
Chi	O
's	O
work	O
showed	O
that	O
the	O
model	O
was	O
functionally	O
equivalent	O
to	O
the	O
data	O
flow	O
model	O
used	O
in	O
existing	O
graphics	O
toolkits	B-Library
such	O
as	O
VTK	O
.	O
</s>
<s>
In	O
their	O
work	O
,	O
"	O
Readings	O
in	O
Information	B-Application
Visualization	I-Application
:	O
Using	O
Vision	O
to	O
Think	O
"	O
,	O
Stuart	O
K	O
.	O
Card	O
,	O
Jock	O
D	O
.	O
Mackinlay	O
,	O
and	O
Ben	O
Shneiderman	O
present	O
their	O
own	O
interpretation	O
of	O
this	O
pattern	O
,	O
dubbing	O
it	O
the	O
"	O
information	B-General_Concept
visualization	I-General_Concept
reference	I-General_Concept
model	I-General_Concept
"	O
.	O
</s>
