<!ENTITY % books.dtd SYSTEM "https://www.sql-und-xml.de/xml-samples/books.dtd">
<!ENTITY % events.dtd SYSTEM "https://www.sql-und-xml.de/xml-samples/events.dtd">

%books.dtd;
%events.dtd;

<!ENTITY % e-a-b.include "INCLUDE">


<![%e-a-b.include;[

<!ELEMENT events-and-books ((%events.extern;)*, (%books.extern;)*)>

<!ATTLIST events-and-books 
	%events.xmlns; CDATA #FIXED %events.xmlns.value; 	
	%books.xmlns; CDATA #FIXED %books.xmlns.value;>

]]>