dtd10   [plain text]


<!DOCTYPE doc [
<!ELEMENT doc ((a | b)+ , c ,  d)*>
<!ELEMENT a (#PCDATA)>
<!ELEMENT b (#PCDATA)>
<!ELEMENT c (#PCDATA)>
<!ELEMENT d (#PCDATA)>
]>
<doc><b>This</b><c> is a</c><d> valid document</d></doc>