<?xml version="1.0" encoding="UTF-8"?>
<ns:library xmlns:ns="http://example.org/ns/library" xmlns:bk="http://example.org/ns/book">
  <bk:book id="B-1">
    <bk:title>The Art of Fun</bk:title>
    <bk:author>J. Findeisen</bk:author>
  </bk:book>
  <bk:book id="B-2">
    <bk:title>Minimal VM Design</bk:title>
    <bk:author>A. Dev</bk:author>
  </bk:book>
</ns:library>