SequenceFeature sf1 = new SequenceFeature("f1", "foo", 2, 3, "far");
SequenceFeature sf2 = new SequenceFeature("f2", "foo", 2, 3, "far");
ds.getSequenceAt(0).addSequenceFeature(sf1);
SequenceFeature sf1 = new SequenceFeature("f1", "foo", 2, 3, "far");
SequenceFeature sf2 = new SequenceFeature("f2", "foo", 2, 3, "far");
ds.getSequenceAt(0).addSequenceFeature(sf1);