Document Type Definition(DTD)
hello.dtd
<!ENTITY lt "<">
<!ENTITY gt ">">
<!ENTITY amp "&">
<!ENTITY apos "'">
<!ENTITY quot """>
<!ELEMENT document (author, section+)>
<!ELEMENT author (given, surname)>
<!ELEMENT given (#PCDATA)>
<!ELEMENT surname (#PCDATA)>
<!ELEMENT section (para+)>
<!ELEMENT para (#PCDATA)>
document
author
section
given
surname
para
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