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What Votan means is that when you declare the variable (ADDON_NAME = "Test") you should put local first (local ADDON_NAME = "Test")
That makes it so that ADDON_NAME is only available to code within that file. So if some other addon calls ADDON_NAME, then it will be nil. self.variable name is not generally defined. If you have a table, the table might have a field called variableName, and then it would be defined, but in all other cases it will not be defined. (and in fact, if self is not a table you will get a lua error - 'Attempt to index a non table variable')
You also cannot do functionName.variableName. Local variables within a function are unavailable outside of it, and global variables within a function will be available anywhere simply with variableName.
I would suggest reading some lua tutorials about scope.
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