<s>
The	O
ANSI-SPARC	B-General_Concept
Architecture	I-General_Concept
(	O
American	O
National	O
Standards	O
Institute	O
,	O
Standards	O
Planning	O
And	O
Requirements	O
Committee	O
)	O
,	O
is	O
an	O
abstract	O
design	O
standard	O
for	O
a	O
database	B-Application
management	I-Application
system	I-Application
(	O
DBMS	O
)	O
,	O
first	O
proposed	O
in	O
1975	O
.	O
</s>
<s>
The	O
ANSI-SPARC	B-General_Concept
model	O
however	O
,	O
never	O
became	O
a	O
formal	O
standard	O
.	O
</s>
<s>
There	O
are	O
three	O
different	O
types	O
of	O
schema	O
corresponding	O
to	O
the	O
three	O
levels	O
in	O
the	O
ANSI-SPARC	B-General_Concept
architecture	I-General_Concept
:	O
</s>
