<s>
SPASS	B-Application
is	O
an	O
automated	B-Application
theorem	I-Application
prover	I-Application
for	O
first-order	O
logic	O
with	O
equality	O
developed	O
at	O
the	O
Max	O
Planck	O
Institute	O
for	O
Computer	O
Science	O
and	O
using	O
the	O
superposition	O
calculus	O
.	O
</s>
<s>
The	O
name	O
originally	O
stood	O
for	O
Synergetic	B-Application
Prover	I-Application
Augmenting	I-Application
Superposition	I-Application
with	I-Application
Sorts	I-Application
.	O
</s>
<s>
The	O
theorem	B-Application
proving	I-Application
system	O
is	O
released	O
under	O
the	O
FreeBSD	O
license	O
.	O
</s>
<s>
An	O
extension	O
of	O
SPASS	B-Application
called	O
SPASS-XDB	O
added	O
support	O
for	O
on-the-fly	O
retrieval	O
of	O
positive	O
unit	O
axioms	O
from	O
external	O
sources	O
.	O
</s>
<s>
SPASS-XDB	O
can	O
thus	O
incorporate	O
facts	O
coming	O
from	O
relational	B-Application
databases	I-Application
,	O
web	O
services	O
,	O
or	O
linked	B-Operating_System
data	I-Operating_System
servers	O
.	O
</s>
<s>
Support	O
for	O
arithmetic	O
using	O
Mathematica	B-Language
was	O
also	O
added	O
.	O
</s>
