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* a query language.
[[File:GBACOrgGraph.pdf|thumb|Organization Graph in GBAC]]
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On the type level organization structures are described in a more general manner. It consists of organization unit types, functional unit types and the same relationship types as on the instance level. Type definitions can be used to create new instances or reuse organization knowledge in case of exceptions (for further reading see <ref name=DISS/> <ref name=EOMAS />).
In GBAC a query language is used to define agents having certain characteristics or abilities. The following table shows the usage of the query language in the context of an access control matrix.
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