<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT authors (team,contributors,thanks)>
<!ELEMENT team (sections+)>
<!ELEMENT contributors (sections+)>
<!ELEMENT thanks (sections+)>
<!ELEMENT section (author+)>
<!ATTLIST section title CDATA #REQUIRED>

<!ELEMENT author (name,nickname?,email?,country?,description)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT nickname (#PCDATA)>
<!ELEMENT email (#PCDATA)>
<!ELEMENT country (#PCDATA)>
<!ELEMENT description (#PCDATA)>