Integrated Data Dictionary
One of the sophisticated features of IDMS was its built-in Integrated Data Dictionary (IDD). The IDD was primarily developed to maintain database definitions. It was itself an IDMS database.
DBAs (database administrators) and other users interfaced with the IDD using a language called Data Dictionary Definition Language (DDDL).
IDD was also used to store definitions and code for other products in the IDMS family such as ADS/Online and IDMS-DC.
IDD's power was that it was extensible and could be used to create definitions of just about anything. Some companies used it to develop in-house documentation.
Read more about this topic: IDMS
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