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windowing O
environment O
behind O
a O
backend O
, O
which O
is O
also O
responsible O
for O
creating O
the O
main O
container O
for O
the O
scene B-Data_Structure
graph I-Data_Structure
; O
this O
top O
level O
container O
is O
called O
the O
stage O
. O
</s>
<s>
The O
PH-tree B-Data_Structure
uses O
the O
bits O
of O
the O
multi-dimensional O
keys O
to O
determine O
their O
position O
in O
the O
tree O
. O
</s>
<s>
A O
common O
extension O
of O
radix B-Data_Structure
trees I-Data_Structure
uses O
two O
colors O
of O
nodes O
, O
' O
black O
' O
and O
' O
white O
' O
. O
</s>
<s>
This O
special-purpose O
device O
helps O
a O
router B-Protocol
perform O
one O
of O
its O
core O
and O
repeated O
functions O
very O
fast O
: O
address O
lookup B-Data_Structure
. O
</s>
<s>
Array B-Data_Structure
partitioning O
can O
improve O
access O
to O