Output of the attached pgm:
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE document SYSTEM "./ExternalDTD.dtd" [
<!ENTITY max "Substituted text">
]><!-- ExternalDTD throws a Negative array size Exception when
trying to parse with the above DTD reference AND an entity declaration--><document>
        <title>The Publishers </title>
        <publisher>
        Alfred Publishing
        15535 Morrison
        South Oaks CA 91403
        &max;
        </publisher>
        <book price="$100" author="Herold" number="no_11">eXtensible Markup Language</book>
        <bookurn xmlns="urn:loc.gov:books" xmlns:isbn="urn:ISBN:0-395-36341-6" xmlns:isbn="urn:ISBN:0-395-36341-6" xmlns="urn:loc.gov:books"></bookurn>
        <pb></pb>
        <pages></pages>

'bookurn' elements gets double namespace declarations which causes well-formedness error.