<?xml version="1.0" encoding="UTF-8"?>
<!-- ===========================================================
      Sample from Zvon XSLT tutorial (www.zvon.org)  
================================================================ -->
<!ELEMENT  source (xslTutorial|doc|ref|note)*>

<!ELEMENT xslTutorial (doc,note*)>
<!ELEMENT doc (#PCDATA|ref)*>
<!ELEMENT  ref EMPTY>
<!ATTLIST ref id IDREF #REQUIRED>
<!ELEMENT note (#PCDATA)>
<!ATTLIST note id ID #REQUIRED>
