A NotStep accepts a single test step or a sequence of test steps
and expects upon execution that each of these steps fails.
It serves basically as container and simply forwards the execution
to each of the contained steps preserving the initial order in which
the steps were provided.
A RepeatStep accepts one or more nested step elements and executes
them as many times as defined in the count attribute.
Before it actually starts the execution of contained steps, the contained
steps are "expanded", i.e.