1.1 ! misho 1: <!DOCTYPE doc [ ! 2: <!ELEMENT doc (a, (b | c)*, d*)? > ! 3: <!ELEMENT a EMPTY> ! 4: <!ELEMENT b EMPTY> ! 5: <!ELEMENT c EMPTY> ! 6: <!ELEMENT d EMPTY> ! 7: ]> ! 8: <doc><a/><d/></doc>