<s>
ARS++	B-Language
was	O
developed	O
in	O
2002	O
for	O
the	O
book	O
Undiluted	O
Programming	O
to	O
demonstrate	O
ARS	B-Application
based	I-Application
programming	I-Application
in	O
a	O
real	O
world	O
context	O
.	O
</s>
<s>
ARS++	B-Language
is	O
used	O
in	O
the	O
book	O
to	O
implement	O
an	O
A++	B-Language
interpreter	B-Application
and	O
an	O
XML	B-Protocol
Database	O
System	O
.	O
</s>
<s>
Even	O
the	O
implementation	O
of	O
ARS++	B-Language
in	O
C	B-Language
was	O
used	O
to	O
demonstrate	O
ARS-based	B-Application
programming	I-Application
.	O
</s>
<s>
Principally	O
the	O
programming	O
language	O
Scheme	B-Language
would	O
have	O
been	O
perfectly	O
all	O
right	O
to	O
be	O
used	O
for	O
these	O
demonstration	O
programs	O
if	O
Scheme	B-Language
had	O
included	O
primitives	O
supporting	O
network	B-Architecture
programming	O
,	O
database	O
programming	O
plus	O
a	O
few	O
others	O
required	O
in	O
this	O
context	O
.	O
</s>
<s>
The	O
definition	O
of	O
the	O
programming	O
language	O
Scheme	B-Language
does	O
not	O
include	O
those	O
primitives	O
however	O
,	O
leaving	O
this	O
issue	O
up	O
to	O
the	O
implementors	O
of	O
the	O
language	O
.	O
</s>
<s>
The	O
consequence	O
is	O
that	O
there	O
exist	O
many	O
Scheme	B-Language
implementations	O
,	O
almost	O
none	O
of	O
them	O
covering	O
all	O
areas	O
essential	O
for	O
real	O
application	O
programs	O
.	O
</s>
<s>
This	O
is	O
the	O
historical	O
background	O
that	O
gave	O
birth	O
to	O
the	O
development	O
of	O
ARS++	B-Language
.	O
</s>
<s>
The	O
name	O
ARS++	B-Language
,	O
being	O
an	O
acronym	O
for	O
ARS	O
+	O
Scheme	B-Language
+	O
Extensions	O
,	O
indicates	O
that	O
ARS++	B-Language
has	O
a	O
lot	O
to	O
do	O
with	O
Scheme	B-Language
but	O
that	O
it	O
is	O
not	O
equivalent	O
to	O
Scheme	B-Language
.	O
</s>
<s>
The	O
first	O
part	O
of	O
the	O
name	O
refers	O
to	O
the	O
core	O
of	O
the	O
language	O
,	O
which	O
is	O
nothing	O
else	O
but	O
A++	B-Language
,	O
i.e.	O
</s>
<s>
The	O
second	O
part	O
in	O
the	O
name	O
of	O
ARS++	B-Language
stands	O
for	O
the	O
primitive	O
functions	O
that	O
are	O
imported	O
from	O
Scheme	B-Language
,	O
giving	O
ARS++	B-Language
almost	O
the	O
same	O
functionality	O
as	O
Scheme	B-Language
.	O
</s>
<s>
Primitive	O
functions	O
are	O
those	O
,	O
that	O
are	O
not	O
and	O
cannot	O
be	O
defined	O
as	O
lambda	O
abstractions	O
because	O
they	O
are	O
representing	O
a	O
functionality	O
that	O
can	O
only	O
be	O
provided	O
by	O
the	O
underlying	O
operating	B-General_Concept
system	I-General_Concept
or	O
the	O
hardware	O
.	O
</s>
<s>
The	O
third	O
part	O
of	O
the	O
name	O
refers	O
to	O
primitive	O
functions	O
that	O
are	O
not	O
defined	O
in	O
R5RS	B-Language
(	O
the	O
official	O
definition	O
of	O
the	O
programming	O
language	O
Scheme	B-Language
)	O
but	O
are	O
nevertheless	O
important	O
for	O
real	O
world	O
programming	O
like	O
functions	O
allowing	O
to	O
work	O
with	O
regular	B-Language
expressions	I-Language
,	O
with	O
TCP/IP	B-Protocol
networks	I-Protocol
,	O
with	O
embedded	O
databases	O
(	O
e.g.	O
</s>
<s>
Berkeley	B-Language
DB	I-Language
,	O
GNU	O
database	O
manager	O
)	O
and	O
a	O
few	O
that	O
provide	O
an	O
interface	O
with	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
From	O
a	O
practical	O
point	O
of	O
view	O
a	O
Scheme	B-Language
implementation	O
that	O
includes	O
support	O
for	O
regular	B-Language
expressions	I-Language
,	O
databases	O
,	O
sockets	O
and	O
also	O
provides	O
an	O
interface	O
to	O
the	O
operating	B-General_Concept
system	I-General_Concept
can	O
be	O
called	O
an	O
ARS++	B-Language
language	O
.	O
</s>
