What does 'subject' mean?
In this connection, we draw your attention to reference (17.11). which describes a system in which user groups can be nested. To quote: "The ability to classify users into a hierarchy of groups provides a powerful tool for administrating (sic) large systems with thousands of users and objects." Note, however, that the obvious place to keep a rècord of which users are in which groups is once again the catalog (or perhaps the database itself), and those records themselves must of course be subject to suitable security controls.
those records which make up the security controls must themselves have their security controlled by other security control records.
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those records which make up the security controls must themselves have their security controlled by other security control records.