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<Aritcle>
  <Main>
...
        </Sect>
     </Main>
   </Article>

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$dom = $parser->parse_file($file);
my $expr = ('//Article//Main//Sect//H3[contains(.,"Include")]|//Articl
+e//Main//Sect//H4[contains(.,"Include")]|//Article//Main[contains(.,"
+Include")]//*[name()="LI"]');
...
foreach $nod(@nodes) {
        print "element: ".$nod->nextNonBlankSibling();    
    }