By MARIO BUNGE
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Extra resources for La Ciencia, su Método y su Filosofía
Also, when both permissions and denials can be specified, the problem naturally arises of how to deal with incompleteness (accesses for which no rule is specified) and inconsistency (accesses for which both a denial and a permission are specified). Dealing with incompleteness (requiring the authorizations to be complete would be very impractical) requires support of a default policy either Access Control Policies and Languages in Open Environments 23 Personal Purchase / / Sales I \Exports \ Production / \ Internal Alice Bob Carol David RepA I \ Elvis Frank RepB I George Fig.
Definition 2 (Data System). A (OTH, UGH, RH, A, Rel) where: data system (DS) is a 5-tuple OTH= (Obj, T , SOT)is an object hierarchy; UGH= (U,G,5 " ~is)a user-group hierarchy; RH= (0,R,SR)is a role hierarchy; A is a set of actions; Rel is a set of relationships that can be dejned on the different elements of DS; S. De Capitani di Vimercati, S. Foresti, S. Samarati 28 Fig. 4. Functional authorization architecture  0 OTH, UGH, and RH are disjoint. Note that this definition of data system is very general as it may be used to represent any system by appropriately instantiating the five components listed above.
Nodes tagged with a position privilege are shown with a restricted label. These proposals have the common characteristic that they present a model for securing XML documents. Recent proposals instead use XML to define languages for expressing protection requirements on any kind of data/resources [2,13,17,39]. Two relevant XML-based access control languages are WS-Policy  and the extensible Access Control Markup Language (XACML) . Based on the WS- Access Control Policies and Languages in Open Environments 37 Security , WS-Policy provides a grammar for expressing Web service policies.
La Ciencia, su Método y su Filosofía by MARIO BUNGE