<?xml version="1.0" encoding="UTF-8"?>
<!-- Source: http://www.w3.org/TR/xquery-use-cases/#xmp-data -->
<!-- Chapter: 1.1.7 DTD for Q10 -->
<!-- Q10 uses an input document named "prices.xml", with this DTD -->
<!ELEMENT prices (book*)>
<!ELEMENT book (title, source, price)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT source (#PCDATA)>
<!ELEMENT price (#PCDATA)>