1 <!ELEMENT document ANY> 2 <!ELEMENT title (#PCDATA)> 3 <!ELEMENT publisher (#PCDATA)> 4 <!ELEMENT book (#PCDATA)> 5 <!ELEMENT bookurn (#PCDATA)> 6 <!ELEMENT xmlns:pages (#PCDATA)> 7 <!ATTLIST book price CDATA "$100"> 8 <!ATTLIST book author CDATA "Herold"> 9 <!ATTLIST book number ID #REQUIRED> 10 <!ATTLIST bookurn xmlns CDATA "10"> 11 <!ATTLIST bookurn xmlns:isbn CDATA "10"> 12 <!ENTITY ws "Walter Sam Communications"> 13 <!ENTITY af "Alfred publication">