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perl-XML-LibXML / example / test.dtd

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<!ELEMENT article (pubData*, pubArticleID*, pubDate+, pubName+, section+, memo*, headline1*, headline2*, byline*, lead*, rest*, graphics*, keywords*, caption*)>
<!ELEMENT pubData (#PCDATA)>
<!ELEMENT pubArticleID (#PCDATA)>
<!ELEMENT pubDate (#PCDATA)>
<!ELEMENT pubName (#PCDATA)>
<!ELEMENT section (#PCDATA)>
<!ELEMENT memo (#PCDATA)>
<!ELEMENT headline1 (#PCDATA)>
<!ELEMENT headline2 (#PCDATA)>
<!ELEMENT byline (#PCDATA)>
<!ELEMENT lead (#PCDATA)>
<!ELEMENT rest (#PCDATA)>
<!ELEMENT graphics (#PCDATA)>
<!ELEMENT keywords (#PCDATA)>
<!ELEMENT caption (#PCDATA)>