SUGGESTED FIX
When I entered in Bug4693341.xml the full path to Bug4693341.dtd
("C:\Users\kshefov\Desktop\impl\Bug4693341.dtd" instead of "Bug4693341.dtd"),
the test passed successfully:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE SupplierOrder SYSTEM "C:\Users\kshefov\Desktop\impl\Bug4693341.dtd" >
<SupplierOrder>
<OrderId>10016</OrderId>
<OrderDate>Wed May 29 12:45:00 PDT 2002</OrderDate>
....................
Something should be done with the path to Bug4693341.dtd. XML-file could be generated automatically with proper path before execution of test() method in Bug4693341Test class.