The following table shows the usage of the query language in the context of an access control matrix.
2.
Access Control Matrix "'model where rows correspond to subjects and columns correspond to objects and subjects, each element contains a set of "'rights "'between subject i and object j or between subject i and subject k.
3.
In any access-control model, the entities that can perform actions on the system are called " subjects ", and the entities representing resources to which access may need to be controlled are called " objects " ( see also Access Control Matrix ).
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