toolkit useful for working with XML documents
de.unirostock.sems.xmltools.* -> de.unirostock.sems.xmlutils.*getOccuringIds -> getOccurringIdsde.unirostock.sems.xmltools.ds.NodeComparer -> de.unirostock.sems.xmlutils.ds.NodeDistance + de.unirostock.sems.xmlutils.ds.NodeDistanceComparatorXyWeighter for TreeDocument creation