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if there was only one extraports state, would create a Port object for each scanned port that was not listed explictly. So for example, if a scan of 100 ports had 5 open ports and an extraports of "filtered", Ndiff would create 95 port records in the "filtered" state in addition to the 5 "open". If there was more than one extraports state this was not possible. This turned out to be a slow operation, out of all proportion to its utility. Here are times for a diff of random-1.xml and random-2.xml, before and after: real 0m11.912s user 0m10.970s sys 0m0.249s real 0m0.773s user 0m0.726s sys 0m0.046s In most cases extraports are not shown in the output, so this was wasted effort. I know of only one place where it affected the output, when an extraports in the A scan because a non-extraports in a different state in the B scan. Then the previous state would be included in the <a> port, where now it will just be listed without a state.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).