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In April 1971, the DBTG published a report containing specifications of a ''Data Manipulation Language'' (DML) and a ''Data Definition Language'' (DDL) for standardization of [[Network model|network database model]]. The first DBTG proposals had already been published in 1969. The specification was subsequently modified and developed in various committees and published by 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 database terminology were introduced by this group, notably the concepts of [[Database schema|schema]] and [[subschema]].
*{{cite book |title=CODASYL COBOL journal of development 1968 |date=1969 |publisher=National Bureau of Standards |___location=Gaithersburg, MD |url=https://nvlpubs.nist.gov/nistpubs/Legacy/hb/nbshandbook106.pdf |access-date=September 10, 2023}}
*{{cite book |title=CODASYL data description language: journal of development, June 1973 |date=1974 |publisher=National Bureau of Standards |___location=Gaithersburg, MD |url=https://nvlpubs.nist.gov/nistpubs/Legacy/hb/nbshandbook113.pdf |access-date=September 10, 2023}}
*{{cite web |last1=Sibley |first1=Edgar H. |title=The CODASYL data base approach: a COBOL example of Design and Use of a Personnel File |url=https://www.govinfo.gov/content/pkg/GOVPUB-C13-0d0d086477e125cd1920a974d2282571/pdf/GOVPUB-C13-0d0d086477e125cd1920a974d2282571.pdf |website=Govinfo |access-date=September 10, 2023}}
==External links==
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