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Subject: RE: [xacml-users] policy inconsistency

Yep.  The problem here is policy analysis.  XACML policy is not easily
reversible (determining what set of parameters would cause a particular
decision). My guess would be that the strategy of policy analysis and
the definition of "inconsistency" would be very much implementation
dependent.   We could possibly specify that in concrete profiles...
Interesting question to discuss.


>recently, i was talking about xacml and got a similar question from the

> audience. the
issue is that once you build a large set of policies and rules, there
could be unintended "collisions" or inconsistencies. combining
algorithms could produce "unexpected" results when multiple policy
sets are combined. these effects are not indeterministic, of course,
but the result of combining policy sets is not always intuitive. if
you have a lot of policies, then it would be useful to find out
inconsistent ones. in order to do that one has to define what is
exactly "inconsistent" policies.


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