1.1 ! misho 1: <?xml version="1.0"?> ! 2: <!DOCTYPE a SYSTEM "dtds/a.dtd" [ ! 3: <!ELEMENT a (#PCDATA | b | c)*> ! 4: <!ELEMENT b (#PCDATA)> ! 5: <!ELEMENT c (#PCDATA)> ! 6: ]> ! 7: <a> violates [ VC: Unique Element Type Declaration ] </a>