transformation (PST) and allow subsequent access to the canonical ParserOutput of the
revision. getSlots() and getCanonicalParserOutput() as well as getSecondaryDataUpdates()
may be used after prepareContent() was called. Calling prepareContent() with the same
-parameters again has no effect. Calling it again with mismatching paramters, or calling
+parameters again has no effect. Calling it again with mismatching parameters, or calling
it after prepareUpdate() was called, triggers a LogicException.
- prepareUpdate() is called after the new revision has been created. This may happen