<!DOCTYPE reference [

<!ELEMENT reference EMPTY>
<!ATTLIST reference
    value	ENTITY	"2orldbook"
    >
    <!-- tests the "attribute default legal" vc -->

<!NOTATION encyclopaedia PUBLIC "-//fooCorp Inc//NOTATION something//EN">
<!ENTITY brittannica SYSTEM "http://www.eb.com/" NDATA encyclopaedia>
<!ENTITY worldbook SYSTEM "http://www.worldbook.com">

]>

<reference value="brittannica"/>