Document type definition

<!DOCTYPE greeting_message [

<!ELEMENT message (greeting, farewell)>

<!ELEMENT greeting (#PCDATA)>

<!ATTLIST greeting type (formal|informal)#IMPLIED>

<!ELEMENT farewell (#PCDATA)>

<!ATTLIST farewell

type (formal|informal) #IMPLIED>

]>

<?xml version=“1.0”? encoding=“UTF-8”><message> <greeting type=informal>Hello, World!</greeting>

<farewell>Goodbye, World!</farewell>

</message>

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