<s>
S-attributed	B-Application
grammars	I-Application
are	O
a	O
class	O
of	O
attribute	B-Application
grammars	I-Application
characterized	O
by	O
having	O
no	O
inherited	O
attributes	O
,	O
but	O
only	O
synthesized	O
attributes	O
.	O
</s>
<s>
Inherited	O
attributes	O
,	O
which	O
must	O
be	O
passed	O
down	O
from	O
parent	O
nodes	O
to	O
children	O
nodes	O
of	O
the	O
abstract	B-Data_Structure
syntax	I-Data_Structure
tree	I-Data_Structure
during	O
the	O
semantic	O
analysis	O
of	O
the	O
parsing	B-Language
process	O
,	O
are	O
a	O
problem	O
for	O
bottom-up	B-Application
parsing	I-Application
because	O
in	O
bottom-up	B-Application
parsing	I-Application
,	O
the	O
parent	O
nodes	O
of	O
the	O
abstract	B-Data_Structure
syntax	I-Data_Structure
tree	I-Data_Structure
are	O
created	O
after	O
creation	O
of	O
all	O
of	O
their	O
children	O
.	O
</s>
<s>
Attribute	O
evaluation	O
in	O
S-attributed	B-Application
grammars	I-Application
can	O
be	O
incorporated	O
conveniently	O
in	O
both	O
top-down	B-Application
parsing	I-Application
and	O
bottom-up	B-Application
parsing	I-Application
.	O
</s>
<s>
Specifications	O
for	O
parser	O
generators	O
in	O
the	O
Yacc	B-Application
family	O
can	O
be	O
broadly	O
considered	O
S-attributed	B-Application
grammars	I-Application
.	O
</s>
<s>
Any	O
S-attributed	B-Application
grammar	I-Application
is	O
also	O
an	O
L-attributed	B-Application
grammar	I-Application
.	O
</s>
