<s>
SPARQL	B-General_Concept
Syntax	I-General_Concept
Expressions	I-General_Concept
(	O
alternatively	O
,	O
SPARQL	B-Language
S-Expressions	O
)	O
is	O
a	O
parse	O
tree	O
(	O
a.k.a.	O
</s>
<s>
concrete	O
syntax	O
)	O
for	O
representing	O
SPARQL	B-Language
Algebra	O
expressions	O
.	O
</s>
<s>
They	O
have	O
been	O
used	O
to	O
apply	O
the	O
BERT	B-General_Concept
language	O
model	O
to	O
create	O
SPARQL	B-Language
queries	O
from	O
natural	O
language	O
questions	O
.	O
</s>
