protected void applyNullRecord(SetRecord toConflict) {
SetRecord setRecord = new SetRecord(toConflict.getTarget(),
toConflict.getVersion());
// let's apply the conflict locally, too, to ensure a same version
setRecord.apply(document);
}
/**
* This method sends a SetRecord to all peers that conflicts with the
* provided one so that this will be reverted to a previous version. This