code: public InjectionTargetType<PersistenceUnitRefType<T>> getOrCreateInjectionTarget()
     {
        List<Node> nodeList = childNode.get("injection-target");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new InjectionTargetTypeImpl<PersistenceUnitRefType<T>>(this, "injection-target", childNode, nodeList.get(0));
        }
        return createInjectionTarget();
     }
docs: If not already created, a new <code>injection-target</code> element will be created and returned.
  Otherwise, the first existing <code>injection-target</code> element will be returned.
  @return the instance defined for the element <code>injection-target</code>