code: public Node findOrCreateChild( Node parent,
                                     String name ) throws RepositoryException {
          return findOrCreateChild(parent, name, null);
      }
docs: Get or create a node with the specified node under the specified parent node.
  
  @param parent the parent node. may not be null
  @param name the name of the child node. may not be null
  @return the existing or newly created child node
  @throws RepositoryException
  @throws IllegalArgumentException if either the parent or name argument is null