<s>
A	O
sublanguage	B-Application
is	O
a	O
subset	O
of	O
a	O
language	O
.	O
</s>
<s>
Sublanguages	B-Application
occur	O
in	O
natural	O
language	O
,	O
computer	O
programming	O
language	O
,	O
and	O
relational	B-Application
databases	I-Application
.	O
</s>
<s>
In	O
informatics	O
,	O
natural	B-Language
language	I-Language
processing	I-Language
,	O
and	O
machine	B-Application
translation	I-Application
,	O
a	O
sublanguage	B-Application
is	O
the	O
language	O
of	O
a	O
restricted	O
domain	O
,	O
particularly	O
a	O
technical	O
domain	O
.	O
</s>
<s>
In	O
mathematical	O
terms	O
,	O
"	O
a	O
subset	O
of	O
the	O
sentences	O
of	O
a	O
language	O
forms	O
a	O
sublanguage	B-Application
of	O
that	O
language	O
if	O
it	O
is	O
closed	O
under	O
some	O
operations	O
of	O
the	O
language	O
:	O
e.g.	O
,	O
if	O
when	O
two	O
members	O
of	O
a	O
subset	O
are	O
operated	O
on	O
,	O
as	O
by	O
and	O
or	O
because	O
,	O
the	O
resultant	O
is	O
also	O
a	O
member	O
of	O
that	O
subset	O
"	O
.	O
</s>
<s>
The	O
term	O
sublanguage	B-Application
has	O
also	O
sometimes	O
been	O
used	O
to	O
denote	O
a	O
computer	B-Language
language	I-Language
that	O
is	O
a	O
subset	O
of	O
another	O
language	O
.	O
</s>
<s>
A	O
sublanguage	B-Application
may	O
be	O
restricted	O
syntactically	O
(	O
it	O
accepts	O
a	O
subgrammar	O
of	O
the	O
original	O
language	O
)	O
,	O
and/or	O
semantically	O
(	O
the	O
set	O
of	O
possible	O
outcomes	O
for	O
any	O
given	O
program	O
is	O
a	O
subset	O
of	O
the	O
possible	O
outcomes	O
in	O
the	O
original	O
language	O
)	O
.	O
</s>
<s>
For	O
instance	O
,	O
ALGOL	B-Language
68S	I-Language
was	O
a	O
subset	O
of	O
ALGOL	B-Language
68	I-Language
designed	O
to	O
make	O
it	O
possible	O
to	O
write	O
a	O
single-pass	O
compiler	B-Language
for	O
this	O
sublanguage	B-Application
.	O
</s>
<s>
SQL	B-Language
(	O
Structured	B-Language
Query	I-Language
Language	I-Language
)	O
statements	O
are	O
classified	O
in	O
various	O
ways	O
,	O
which	O
can	O
be	O
grouped	O
into	O
sublanguages	B-Application
,	O
commonly	O
:	O
a	O
data	B-Application
query	I-Application
language	I-Application
(	O
DQL	O
)	O
,	O
a	O
data	B-Language
definition	I-Language
language	I-Language
(	O
DDL	O
)	O
,	O
a	O
data	B-Application
control	I-Application
language	I-Application
(	O
DCL	O
)	O
,	O
and	O
a	O
data	B-Language
manipulation	I-Language
language	I-Language
(	O
DML	O
)	O
.	O
</s>
<s>
In	O
relational	B-Application
database	I-Application
theory	O
,	O
the	O
term	O
"	O
sublanguage	B-Application
"	O
,	O
first	O
used	O
for	O
this	O
purpose	O
by	O
E	O
.	O
F	O
.	O
Codd	O
in	O
1970	O
,	O
refers	O
to	O
a	O
computer	B-Language
language	I-Language
used	O
to	O
define	O
or	O
manipulate	O
the	O
structure	O
and	O
contents	O
of	O
a	O
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
(	O
RDBMS	O
)	O
.	O
</s>
<s>
Typical	O
sublanguages	B-Application
associated	O
with	O
modern	O
RDBMS	O
's	O
are	O
QBE	B-Application
(	O
Query	B-Application
by	I-Application
Example	I-Application
)	O
and	O
SQL	B-Language
(	O
Structured	B-Language
Query	I-Language
Language	I-Language
)	O
.	O
</s>
<s>
The	O
fifth	O
rule	O
is	O
known	O
as	O
the	O
Comprehensive	O
data	O
sublanguage	B-Application
rule	O
,	O
and	O
states	O
:	O
</s>
