Exactly what does a set Object mean within the Pole Position Client Server Model benchmarks (see picture below)?

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I'm trying to puzzle out which benchmarks I ought to take a look at for any small , simple web application... must i be searching in the Flatobject benchmarks? Benchmarks doc available at http://polepos.sourceforge.net/results/PolePositionClientServer.pdf

Considering that another tests from the benchmark test

  • an intricate object graph
  • nested lists
  • objects having a 5 level inheritance structure

I'd state that a set object is definitely an object without any relation holiday to a entity/table, and which directly stretches java.lang.Object.