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Initial revision
1: <?xml version="1.0"?> 2: <!DOCTYPE doc [ 3: <!ELEMENT doc ((a | b) , (c | d))+> 4: <!ELEMENT a (#PCDATA)> 5: <!ELEMENT b (#PCDATA)> 6: <!ELEMENT c (#PCDATA)> 7: <!ELEMENT d (#PCDATA)> 8: ]> 9: <doc><b>This</b><c> is a valid document</c></doc>