<?xml  version="1.0"?>
<!-- validity constraint check for Production 56(Negative test)-->
<!DOCTYPE test
 [
 <!ELEMENT test ANY>
 <!ELEMENT landscape EMPTY>
 <!ENTITY parsedentity1 SYSTEM "ibm56iv01.xml">
 <!ENTITY parsedentity2 SYSTEM "ibm56iv02.xml">
 <!ATTLIST landscape sun ENTITIES #IMPLIED>
]>
<test>
<landscape sun = "parsedentity1 parsedentity2"></landscape>
In an attribute declaration, values of type ENTITIES match the Name production and the ENTITIES value
matches one or more names of parsed entities declared in the DTD. .
</test>