<s>
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
software	O
generation	O
,	O
where	O
a	O
model	O
of	O
a	O
product	O
line	O
is	O
a	O
tuple	O
of	O
0-ary	O
and	O
1-ary	O
functions	O
(	O
program	O
transformations	O
)	O
.	O
</s>
<s>
A	O
GenVoca	B-Application
model	O
of	O
a	O
product	O
line	O
is	O
a	O
tuple	O
whose	O
components	O
are	O
features	O
(	O
0-ary	O
or	O
1-ary	O
functions	O
)	O
.	O
</s>
<s>
As	O
a	O
simple	O
example	O
,	O
consider	O
GenVoca	B-Application
model	O
M	O
that	O
contains	O
three	O
features	O
a-c	O
:	O
</s>
<s>
Model	O
M	O
is	O
constructed	O
by	O
adding	O
the	O
meta-features	O
of	O
MM	O
,	O
where	O
+	O
is	O
the	O
composition	O
operation	O
(	O
see	O
FOSD	B-Application
)	O
.	O
</s>
<s>
That	O
is	O
,	O
different	O
MM	O
expressions	O
correspond	O
to	O
GenVoca	B-Application
models	O
of	O
different	O
product	O
lines	O
..	O
</s>
