for (StatementGroup sg : itemDocument.getStatementGroups()) {
	for (Statement s : sg.getStatements()) {// for each statement
		for (SnakGroup q : s.getClaim().getQualifiers()) {//for each qualifier associated to the statement
			// do something
		}
		for (Reference r : s.getReferences()) {//for each reference associated to the statement
			for (SnakGroup snakGroup : r.getSnakGroups()) {
				// do something
			}
		}
	}