<?xml  version="1.0"?>
<!-- validity constraint check for Production 56(Negative test)-->
<!DOCTYPE test
 [
 <!ELEMENT test ANY>
 <!ELEMENT landscape EMPTY>
 <!ENTITY image SYSTEM "d:\testspec\images\sunset.gif" NDATA gif>
 <!ATTLIST landscape sun ENTITY #IMPLIED>
]>
<test>
<landscape sun = "notimage"></landscape>
In the attribute decl, values of type ENTITY match the Name production
but does not match the name of any entity declared in the DTD
</test>