REPOSITORIES, DATA DICTIONARIES, ENCYCLOPAEDIAS, CATALOGS AND DIRECTORIES
There are a range of systems, or subsystems, available that have the common primary purpose of storing, manipulating or defining metadata – ‘information about information’ – but they appear under a number of different names, such as repositories, data dictionaries, encyclopaedias, catalogs and directories.
The last of these two, catalogs and directories, are usually provided as part of a database management system; each directory or catalog is, therefore, associated with a single database instance. Data dictionaries and encyclopaedias are normally associated with tools that are used to support software engineering; an instance of a data dictionary or an encyclopaedia is ...
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