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TheData Base Task Group (DBTG) was a working group founded in 1965 by theCobol Committee, formerlyProgramming Language Committee, of theConference of Data Systems Language (CODASYL).
In April 1971, The DBTG published a report containing specifications of aData Manipulation Language (DML) and aData Definition Language (DDL) for standardization of networkdatabase models. The first DBTG proposals had already been published in 1969. The specification was subsequently modified and developed in various committees and published in other reports in 1973 and 1978. The specification is often referred to as the DBTG database model or the CODASYL database model. As well as the data model, many basic concepts of databaseterminology were introduced by this group, notably the concepts ofschema and subschema.
