One item, typically a book, in a collection of books
<!ELEMENT collection-member (title, ext-link+) >
<collection dtd-version="2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML"> <collection-meta> <collection-id>Quacks</collection-id> <collection-name>Famous Quacks</collection-name> <abstract><p>Biographies of famous quacks and frauds. The following books have been digitized and the full text has been made available both online (HTML) and in PDF format.</p></abstract> <collection-list> <collection-member> <title>Perkins and the Perkins Tractor</title> <ext-link ext-link-type="URL" xlink:href="http://www.ncbi.nlm.nih.gov/books/perkins" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple"></ext-link> </collection-member> <collection-member> <title>The Practical Phrenologist</title> <ext-link ext-link-type="URL" xlink:href="http://www.ncbi.nlm.nih.gov/books/Fowler" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple"></ext-link> </collection-member> </collection-list> </collection-meta> </collection>
bookcollection.dtd