1 <!DOCTYPE doc [ 2 <!ELEMENT doc (#PCDATA | a | b)*> 3 <!ELEMENT a EMPTY> 4 <!ELEMENT b (#PCDATA)> 5 <!ELEMENT c (#PCDATA)> 6 ]> 7 <doc> This <b>seems</b> Ok <a/> but this <c>was not declared</c></doc> 8
