Problem with ATTLIST

Hello,

I am hoping you can help me. I am just learning xml and have an xml file
with a DTD containing the attribute lists. When I view this file in the
browser, it is fine, but when I try to pull it into an html file it is
unable to load the file. If I remove the ATTLIST statements from the xml
file, it works fine. I have attached both the xml file and the html file.

Thanks,

Elizabeth

 <<Listing5-13.htm>>  <<Listing6-1.xml>>