<s>
The	O
SQL/Schemata	B-Language
,	O
or	O
Information	O
and	O
Definition	O
Schemas	O
,	O
part	O
of	O
the	O
SQL	B-Language
standard	O
is	O
defined	O
by	O
ISO/IEC	B-Language
9075-11:2008	I-Language
.	O
</s>
<s>
SQL/Schemata	B-Language
defines	O
the	O
information	O
schema	O
and	O
definition	O
schema	O
,	O
providing	O
a	O
common	O
set	O
of	O
tools	O
to	O
make	O
SQL	B-Language
databases	I-Language
and	O
objects	O
self-describing	O
.	O
</s>
<s>
These	O
tools	O
include	O
the	O
,	O
and	O
integrity	O
constraints	O
,	O
,	O
features	O
and	O
of	O
ISO/IEC	B-Language
9075	I-Language
,	O
support	O
of	O
features	O
provided	O
by	O
SQL-based	O
DBMS	B-General_Concept
implementations	O
,	O
SQL-based	O
DBMS	B-General_Concept
implementation	O
information	O
and	O
,	O
and	O
the	O
by	O
the	O
DBMS	B-General_Concept
implementations	O
.	O
</s>
<s>
SQL/Schemata	B-Language
defines	O
a	O
number	O
of	O
features	O
,	O
some	O
of	O
which	O
are	O
mandatory	O
.	O
</s>
