<s>
Praspel	B-Language
(	O
PHP	B-Application
Realistic	O
Annotation	O
and	O
Specification	B-Application
Language	O
)	O
is	O
a	O
formal	B-Application
specification	I-Application
language	O
for	O
PHP	B-Application
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
design-by-contract	B-Application
paradigm	O
and	O
uses	O
preconditions	O
,	O
postconditions	O
,	O
invariants	B-Application
etc	O
.	O
</s>
<s>
Specifications	B-Application
are	O
written	O
in	O
the	O
comments	O
of	O
the	O
PHP	B-Application
code	O
(	O
always	O
accessible	O
)	O
.	O
</s>
<s>
Praspel	B-Language
is	O
used	O
for	O
manual	O
or	O
automatic	O
software	O
validation	O
and	O
verification	O
,	O
thanks	O
to	O
realistic	O
domains	O
.	O
</s>
