Remark In [13], it is shown that the class P2DCFPL is incomparable but not disjoint with all the four families of RML, CFML, TRML and TCFML in contrast to the proper containmentresultinTheorems2and3,therbyshowingthe increase in generative power of the extended 2D CF picture grammar model considered here although this increase in generative power is to be expected.