OASIS eXtensible Access Control Markup Language (XACML) TC

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  • 1.  negating target matches

    Posted 02-20-2004 04:04
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    Subject: negating target matches


    
    In a recent conversation someone asked my why there aren't "not-equal" 
    functions to go with all the "equal" functions. I naively responded that 
    you can always use the "not" function, but he explained that he wanted 
    this for Target Matching, e.g. "match any subject who doesn't have this 
    name" or "match any access not for this server."
    
    It got me thinking about Targets...we have some of the obvious boolean 
    operations covered (we can say "and" and "or"), but we don't have 
    negation. I'm loathe to bring this up when we're already so far along on 
    2.0, but I'm curious what other people think. What's your opinon about 
    having a flag (or something) that negates a TargetMatch?
    
    In a related vein, I'm somewhat surprised that new functions haven't 
    been proposed for 2.0. Does anyone have any new functions that they 
    think would be useful? In the afore-mentioned conversation I was asked 
    about some of the standard string functions like concatination, 
    substring, etc. (thinking back, these are functions that I've also 
    wanted to use in policies). I've only been thinking about this for a 
    short time, but I think they would be useful...anyway, I wanted to get 
    some opinions on that too.
    
    I'll get back to my real work now :)
    
    
    seth
    
    


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