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libxml2
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</c><d> valid document</d></doc>