Example of XML Grammar

<!ELEMENT doc (publication)*>

<!ELEMENT publication (title,author+,date,keywords?)>

<!ELEMENT title (#PCDATA)>

<!ELEMENT author (lastname, firstname)>

<!ELEMENT date (#PCDATA)>

<!ELEMENT lastname (#PCDATA)>

<!ELEMENT firstname (#PCDATA)>

<!ELEMENT keywords (keyword)+>

<!ELEMENT keyword (#PCDATA)>

<!ATTLIST publication number ID #REQUIRED>

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