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https://issues.apache.org/jira/browse/ACCUMULO-241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179903#comment-13179903
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David Medinets commented on ACCUMULO-241:
-----------------------------------------

Doh! For some reason I kept not seeing the word 'visibility'. Now I understand 
what labels are being discussed. Would it make sense to use syntax like 
NOT(FOO) instead of !FOO in labels. Using function-based syntax (if that 
terminology makes sense) reduces the need for fiddly single-character flags and 
should be more readable. It also leaves the door open for an extensible 
mechanism whereby keywords can be attached to user-supplied functionality.
                
> Visibility labels should blacklist non-ASCII characters instead of 
> whitelisting select ASCII characters
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-241
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-241
>             Project: Accumulo
>          Issue Type: Improvement
>    Affects Versions: 1.3.5
>            Reporter: John Vines
>              Labels: visibility
>             Fix For: 1.3.6
>
>
> We currently whitelist our visibility labels to only allow alphanumerics and 
> a few select delimiting characters. While we strive for human-readable 
> labels, we should instead utilize a blacklist approach where we disallow 
> parentheses, ampersands, pipes, and any non-ASCII characters. This will 
> provide users with more flexibility in labeling, while still sticking to 
> human readability.

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