Attribute attr = new DefaultAttribute( "attr0" );
attr.add( "val0" );
attr.add( "val1" );
attr.add( "val2" );
Modification item = new DefaultModification( ModificationOperation.ADD_ATTRIBUTE, attr );
req.addModification( item );
attr = new DefaultAttribute( "attr1" );
attr.add( "val3" );
item = new DefaultModification( ModificationOperation.REMOVE_ATTRIBUTE, attr );
req.addModification( item );