Current File : //opt/RZphp70/includes/test/XML_DTD/tests/children.dtd

<!ELEMENT foo (test1|test2|test3|test4|test5|test6|test7|test8|test9)+>

<!ELEMENT a EMPTY>
<!ELEMENT bbb EMPTY>
<!ELEMENT c EMPTY>
<!ELEMENT dddd EMPTY>

<!ELEMENT test1 (a)>
<!ELEMENT test2 (a|bbb|c|dddd)>
<!ELEMENT test3 (a|bbb)*>
<!ELEMENT test4 (a,bbb,c,dddd)>
<!ELEMENT test5 (a,bbb,c,dddd)+>
<!ELEMENT test6 ((a|bbb),(c|dddd))>
<!ELEMENT test7 (a,(c|dddd))>
<!ELEMENT test8 (a?,dddd+,c*)>
<!ELEMENT test9 (a,(c|bbb)*)>