<s>
Baby	B-Language
Modula-3	I-Language
is	O
a	O
functional	B-Language
programming	I-Language
sublanguage	B-Application
of	O
Modula-3	B-Language
(	O
safe	O
subset	O
)	O
programming	O
language	O
based	O
on	O
ideals	O
invented	O
by	O
Martín	O
Abadi	O
.	O
</s>
<s>
It	O
is	O
an	O
object-oriented	B-Language
programming	I-Language
language	I-Language
for	O
studying	O
programming	O
language	O
design	O
;	O
one	O
part	O
of	O
it	O
is	O
implicitly	O
prototype-oriented	B-Application
,	O
and	O
the	O
other	O
is	O
explicitly	O
statically	O
typed	O
designed	O
for	O
studying	O
computer	B-General_Concept
science	I-General_Concept
type	O
theory	O
.	O
</s>
<s>
It	O
has	O
been	O
checked	O
as	O
a	O
formal	O
language	O
of	O
metaprogramming	B-Application
systems	O
.	O
</s>
<s>
It	O
comes	O
from	O
the	O
Scandinavian	O
School	O
of	O
object-oriented	B-Language
languages	I-Language
.	O
</s>
<s>
Abadi	O
tried	O
to	O
give	O
an	O
example	O
of	O
pure	O
object-oriented	B-Language
language	I-Language
which	O
would	O
allow	O
studying	O
the	O
formal	B-Application
semantics	I-Application
of	O
objects	O
.	O
</s>
<s>
"	O
Baby	B-Language
Modula-3	I-Language
is	O
defined	O
with	O
a	O
structured	O
operational	O
semantics	B-Application
and	O
with	O
a	O
set	O
of	O
static	O
type	O
rules	O
.	O
</s>
<s>
A	O
denotational	B-Application
semantics	I-Application
guarantees	O
the	O
soundness	O
of	O
this	O
definition.	O
"	O
</s>
<s>
Luca	O
Cardelli	O
and	O
Martín	O
Abadi	O
wrote	O
the	O
book	O
A	O
Theory	O
of	O
Objects	O
in	O
1996	O
,	O
laying	O
out	O
formal	O
calculi	O
for	O
the	O
semantics	B-Application
of	O
object-oriented	B-Language
programming	I-Language
languages	I-Language
.	O
</s>
<s>
Baby	B-Language
Modula-3	I-Language
influenced	O
this	O
work	O
according	O
to	O
Cardelli	O
,	O
and	O
guided	O
a	O
calculus	O
of	O
the	O
type	O
of	O
self	B-Application
in	O
Types	O
for	O
object	O
and	O
the	O
type	O
of	O
'	O
self	B-Application
 '	O
.	O
</s>
<s>
It	O
has	O
opened	O
the	O
way	O
for	O
work	O
on	O
Modula-3	B-Language
formal	O
semantic	O
checking	O
systems	O
,	O
for	O
object-oriented	B-Language
type	O
system	O
programming	O
languages	O
that	O
have	O
been	O
used	O
to	O
model	O
the	O
formal	B-Application
semantics	I-Application
of	O
languages	O
such	O
as	O
Ada	B-Language
and	O
C	B-Language
.	O
</s>
