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Re: [tlaplus] Re: How to obtain the value in a function



I am checking a policy such as:

image.png

and i have a TLA+ representation as:

image.png
I need  a property conflict to check  where in the same statement, there is deny and allow for the same set of op and obj

On Mon, Jul 26, 2021 at 1:29 PM Andrew Helwer <andrew.helwer@xxxxxxxxx> wrote:
Since this sort of value comparison across possible steps isn't something you can really do in TLA+ (other than trivially - you've hardcoded the values of these steps so you can also hardcode the comparison of "deny" = "allow", which would of course be false) the issue is with how you've chosen to model your desired behavior. What are you trying to do?

Andrew


On Monday, July 26, 2021 at 6:35:33 AM UTC-4 chero...@xxxxxxxxx wrote:
Statement1==/\effect'="allow"
            /\action'="close"
            /\resource'="db1"
      
Statement2==/\effect'="deny"
            /\action'="close"
            /\resource'="db1"


Hello:

In the above statements, i need to compare the values of effect in statement1 and effect in statement2. I am learning TLA+ and would like to know the equivalent of Statement1[effect] in TLA+ (I need to return the value allow so that i can compare with  effect in Statement2)

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