<s>
The	O
Data	B-Language
Base	I-Language
Task	I-Language
Group	I-Language
(	O
DBTG	B-Language
)	O
was	O
a	O
working	O
group	O
founded	O
in	O
1965	O
(	O
initially	O
named	O
the	O
List	B-Language
Processing	I-Language
Task	I-Language
Force	I-Language
and	O
later	O
renamed	O
to	O
DBTG	B-Language
in	O
1967	O
)	O
by	O
the	O
Cobol	O
Committee	O
,	O
formerly	O
Programming	O
Language	O
Committee	O
,	O
of	O
the	O
Conference	O
of	O
Data	O
Systems	O
Language	O
(	O
CODASYL	B-Language
)	O
.	O
</s>
<s>
The	O
DBTG	B-Language
was	O
chaired	O
by	O
William	O
Olle	O
of	O
RCA	O
.	O
</s>
<s>
In	O
April	O
1971	O
,	O
the	O
DBTG	B-Language
published	O
a	O
report	O
containing	O
specifications	O
of	O
a	O
Data	O
Manipulation	O
Language	O
(	O
DML	O
)	O
and	O
a	O
Data	O
Definition	O
Language	O
(	O
DDL	O
)	O
for	O
standardization	O
of	O
network	B-General_Concept
database	I-General_Concept
model	I-General_Concept
.	O
</s>
<s>
The	O
first	O
DBTG	B-Language
proposals	O
had	O
already	O
been	O
published	O
in	O
1969	O
.	O
</s>
<s>
The	O
specification	O
is	O
often	O
referred	O
to	O
as	O
the	O
DBTG	B-Language
database	O
model	O
or	O
the	O
CODASYL	B-Language
database	O
model	O
.	O
</s>
<s>
As	O
well	O
as	O
the	O
data	O
model	O
,	O
many	O
basic	O
concepts	O
of	O
database	O
terminology	O
were	O
introduced	O
by	O
this	O
group	O
,	O
notably	O
the	O
concepts	O
of	O
schema	B-Application
and	O
subschema	O
.	O
</s>
