<?xml  version="1.0"?>
<!-- validity constraint check for Production 56(Negative test)-->
<!DOCTYPE test
 [
 <!ELEMENT test ANY>
 <!ELEMENT landscape EMPTY>
 <!ENTITY parsedentity SYSTEM "ibm56iv01.xml" >
 <!ATTLIST landscape sun ENTITY #IMPLIED>
]>
<test>
<landscape sun = "parsedentity"></landscape>
In an attribute declaration, values of type ENTITY match the Name production and the ENTITY value
matches the name of a parsed entity declared in the DTD. 
</test>