<!doctype biblio [
<!element biblio - o (book*)>
<!element book  - o 
	((author | editor) &   title &   edition? &  
	 publish &  series? &  vol? &  address? &   
 	 month? &   year)>
<!element (author | editor | title | edition | publish | series | vol
| address | month | year) - o (#pcdata)>
]>
<biblio>
<book>
<author> Harold Abelson and Gerald Jay Sussman 
<title> Structure and Interpretation of Computer Programs 
<publish> MIT Press 
<year> 1985 

<book>
