<s>
A	O
scene	B-Application
description	I-Application
language	I-Application
is	O
any	O
description	B-General_Concept
language	I-General_Concept
used	O
to	O
describe	O
a	O
scene	O
to	O
a	O
3D	O
renderer	O
,	O
such	O
as	O
a	O
ray	B-Algorithm
tracer	I-Algorithm
.	O
</s>
<s>
The	O
scene	O
is	O
written	O
in	O
a	O
text	B-Application
editor	I-Application
(	O
which	O
may	O
include	O
syntax	O
highlighting	O
)	O
,	O
as	O
opposed	O
to	O
being	O
modeled	O
in	O
a	O
graphical	O
way	O
,	O
but	O
a	O
3D	B-Algorithm
modelling	I-Algorithm
program	I-Algorithm
may	O
allow	O
for	O
a	O
scene	O
to	O
be	O
exported	O
to	O
a	O
specified	O
scene	B-Application
description	I-Application
language	I-Application
.	O
</s>
<s>
Some	O
scene	B-Application
description	I-Application
languages	I-Application
may	O
include	O
variables	O
,	O
constants	O
,	O
conditional	B-Language
statements	I-Language
,	O
and	O
while	O
and	O
for	B-Language
loops	I-Language
.	O
</s>
<s>
For	O
example	O
,	O
3DMLW	B-Language
and	O
X3D	B-Application
are	O
XML-based	O
scene	B-Application
description	I-Application
languages	I-Application
;	O
YafaRay	B-Language
also	O
employs	O
an	O
XML-based	O
language	O
.	O
</s>
<s>
Tao	O
Presentations	O
uses	O
XL	O
as	O
a	O
dynamic	O
document	O
description	B-General_Concept
language	I-General_Concept
.	O
</s>
<s>
POV-Ray	B-Application
has	O
its	O
own	O
Turing-complete	O
language	O
.	O
</s>
