<s>
Feature-oriented	B-Application
programming	I-Application
or	O
feature-oriented	B-Application
software	I-Application
development	I-Application
(	O
FOSD	B-Application
)	O
is	O
a	O
general	O
paradigm	O
for	O
program	B-Application
synthesis	I-Application
in	O
software	O
product	O
lines	O
.	O
</s>
<s>
The	O
feature-oriented	B-Application
programming	I-Application
page	O
is	O
recommended	O
,	O
it	O
explains	O
how	O
an	O
FOSD	B-Application
model	O
of	O
a	O
domain	O
is	O
a	O
tuple	O
of	O
0-ary	O
functions	O
(	O
called	O
values	O
)	O
and	O
a	O
set	O
of	O
1-ary	O
(	O
unary	O
)	O
functions	O
called	O
features	O
.	O
</s>
<s>
This	O
page	O
discusses	O
multidimensional	O
generalizations	O
of	O
FOSD	B-Application
models	O
,	O
which	O
are	O
important	O
for	O
compact	O
specifications	O
of	O
complex	O
programs	O
.	O
</s>
<s>
This	O
involves	O
the	O
use	O
of	O
multiple	O
orthogonal	O
GenVoca	B-Application
models	O
.	O
</s>
<s>
Models	O
L	O
and	O
T	O
are	O
orthogonal	O
GenVoca	B-Application
models	O
:	O
one	O
expresses	O
the	O
feature-based	O
structure	O
of	O
the	O
E	O
tool	O
,	O
and	O
the	O
other	O
the	O
feature-based	O
structure	O
of	O
its	O
input	O
language	O
.	O
</s>
<s>
Wm	O
...	O
be	O
a	O
GenVoca	B-Application
model	O
of	O
m	O
features	O
.	O
</s>
<s>
In	O
general	O
,	O
a	O
product	O
of	O
a	O
product	O
line	O
may	O
be	O
represented	O
by	O
n	O
expressions	O
,	O
from	O
n	O
orthogonal	O
and	O
abstract	O
GenVoca	B-Application
models	O
G1	O
...	O
Gn	O
.	O
</s>
