Re: [cti-cybox] CybOX Patterning question

["Piazza, Rich" <rpiazza@mitre.org>]

John-Mark wrote:

 

There is also the point that some qualifiers make sense to be greedy, REPEAT and START/STOP, while WITHIN be non-greedy as it doesn't make sense to apply to only one Observation _expression_.  I would prefer NOT to split these as it will confuse writers and readers of these patterns.  Yes, they could be described w/ a simple precedence table, but that would just add another rule that people have to memorize.

 

            I put my vote in to make the grammar explicitly indicate the precedence difference with WITHIN…

 

            Greg Back suggested something like this:

 

observation_expression

: observation_expression ((“FOLLOWEDBY” | “ALONGWITH”) observation_expression)*    

within_qualifier?

 

 

Also I prefer option #2…

 

            Rich