}
DumperOptions options = new DumperOptions();
/* Use a block YAML arrangement */
options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
SkipNullRepresenter representer = new SkipNullRepresenter();
/* Use Tag.MAP to avoid the class name being included as global tag */
representer.addClassTag(RawColumnFamily.class, Tag.MAP);
representer.addClassTag(Keyspaces.class, Tag.MAP);
representer.addClassTag(ColumnDefinition.class, Tag.MAP);
Dumper dumper = new Dumper(representer, options);
Yaml yaml = new Yaml(dumper);
Keyspaces ks = new Keyspaces();
ks.keyspaces = keyspaces;
return yaml.dump(ks);