public void add(RefEntity child) {
if (myChildren == null) {
myChildren = new ArrayList<RefEntity>();
}
myChildren.add(child);
((RefEntityImpl) child).setOwner(this);
}
protected void removeChild(RefEntity child) {
if (myChildren != null) {
myChildren.remove(child);
((RefEntityImpl) child).setOwner(null);
}
}