Current File : //opt/RZphp56/includes/test/XML_DTD/tests/content.dtd

<!ELEMENT foo (bar|bar2|bar3|bar4)+>
<!ELEMENT bar (#PCDATA)>
<!ELEMENT bar2 ANY>
<!ELEMENT bar3 EMPTY>
<!ELEMENT jack EMPTY>
<!ELEMENT bar4 (#PCDATA|jack|bar3)*>