List<Interval<String>> stringIntervalList = new ArrayList<Interval<String>>();
stringIntervalList.add(new Interval<String>(Double.NEGATIVE_INFINITY,1.,"a"));
stringIntervalList.add(new Interval<String>(2.,3.,"b"));
stringIntervalList.add(new Interval<String>(4.,Double.POSITIVE_INFINITY,"c"));
DynamicString dynamicString = new DynamicString(stringIntervalList);
e3.getEdgeData().getAttributes().setValue(edgeCol2.getIndex(), dynamicString);
exporter = new ExporterGEXF();
exporter.setWorkspace(workspace);
}