container/services/src/main/java/org/mobicents/slee/runtime/sbbentity/ChildRelationImpl.java
@SuppressWarnings("rawtypes")
    public boolean removeAll(Collection c) {
        boolean flag = true;
        if (c == null)
            throw new NullPointerException(" null collection ! ");
        for ( Iterator it = c.iterator(); it.hasNext();	) {
           flag &= this.remove( it.next());
            
        }
        return flag;
    }
@SuppressWarnings("rawtypes")
    public boolean removeAll(Collection c) {
        boolean flag = true;
        if (c == null)
            throw new NullPointerException(" null collection ! ");
        for ( Iterator it = c.iterator(); it.hasNext();	) {
           flag &= this.remove( it.next());
            
        }
        return flag;
    }
Removing an SBB entity from a child relation initiates a cascading
removal of the SBB entity tree rooted by the SBB entity, similar to
invoking the remove method on an SBB local object that represents the SBB
entity.