Span
is an optimized SimpleConstituent
object. It provides exactly the same functionality as a SimpleConstituent, but by being final, and with its own implementation of Span equality, it runs faster, so as to placate Dan Klein. (With JDK1.3 client, it still doesn't run as fast as an implementation outside of the SimpleConstituent hierarchy, but with JDK1.3 server, it does! And both versions are several times faster with -server than -client, so that should be used.)
@author Christopher Manning
@version 2001/01/08
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