<s>
In	O
computing	B-General_Concept
science	I-General_Concept
and	O
informatics	O
,	O
nesting	B-General_Concept
is	O
where	O
information	O
is	O
organized	O
in	O
layers	O
,	O
or	O
where	O
objects	O
contain	O
other	O
similar	O
objects	O
.	O
</s>
<s>
Nesting	B-General_Concept
can	O
mean	O
:	O
</s>
<s>
information	B-Application
hiding	I-Application
:	O
</s>
<s>
nested	O
data	B-General_Concept
structures	I-General_Concept
such	O
as	O
records	O
,	O
objects	O
,	O
classes	O
,	O
etc	O
.	O
</s>
<s>
In	O
a	O
spreadsheet	B-Application
functions	O
can	O
be	O
nested	O
one	O
into	O
another	O
,	O
making	O
complex	O
formulas	O
.	O
</s>
<s>
The	O
function	O
wizard	O
of	O
the	O
OpenOffice.org	B-Application
Calc	I-Application
application	O
allows	O
to	O
navigate	O
through	O
multiple	O
levels	O
of	O
nesting	B-General_Concept
,	O
letting	O
the	O
user	O
to	O
edit	O
(	O
and	O
possibly	O
correct	O
)	O
each	O
one	O
of	O
them	O
separately	O
.	O
</s>
<s>
In	O
this	O
Microsoft	B-Application
Excel	I-Application
formula	O
,	O
the	O
SUM	O
function	O
is	O
nested	O
inside	O
the	O
IF	O
function	O
.	O
</s>
<s>
That	O
is	O
why	O
modern	O
programming	O
environments	O
-as	O
well	O
as	O
spreadsheet	B-Application
programs	I-Application
-	O
highlight	O
in	O
bold	O
type	O
the	O
pair	O
corresponding	O
to	O
the	O
current	O
editing	O
position	O
.	O
</s>
<s>
In	O
structured	B-Language
programming	I-Language
languages	O
,	O
nesting	B-General_Concept
is	O
related	O
to	O
the	O
enclosing	O
of	O
control	O
structures	O
one	O
into	O
another	O
,	O
usually	O
indicated	O
through	O
different	O
indentation	O
levels	O
within	O
the	O
source	O
code	O
,	O
as	O
it	O
is	O
shown	O
in	O
this	O
simple	O
BASIC	O
function	O
:	O
</s>
<s>
Some	O
languages	O
such	O
as	O
Pascal	B-Application
and	O
Ada	B-Language
have	O
no	O
restrictions	O
on	O
declarations	O
depending	O
on	O
the	O
nesting	B-General_Concept
level	O
,	O
allowing	O
precisely	O
nested	O
subprograms	O
or	O
even	O
nested	O
packages	O
(	O
Ada	B-Language
)	O
.	O
</s>
<s>
Nested	O
data	B-General_Concept
structures	I-General_Concept
are	O
also	O
commonly	O
encountered	O
in	O
programming	O
.	O
</s>
<s>
In	O
the	O
functional	B-Language
programming	I-Language
languages	I-Language
,	O
such	O
as	O
Lisp	B-Language
,	O
a	O
list	O
data	B-General_Concept
structure	I-General_Concept
exists	O
as	O
does	O
a	O
simpler	O
atom	O
data	B-General_Concept
structure	I-General_Concept
.	O
</s>
