[phpXML] Help with DTDs?

[<Adm...@ne...>]

 <<test.zip>> 
Hi all,

Included in the attached test.zip file are 3 files:

1. test.php - an example script for this question
2. xmlfile_faulty.xml - an xml file that does not work with test.php (ie. it
does not return the <sub> element as I intended
3. xmlfile_good.xml - an xml file that works correctly with test.php

The only difference between the two xml files is at the start of the DTD
(and the case of the elements)...
xmlfile_good.xml:
<!ELEMENT resp (response)>

xmlfile_faulty.xml:
<!ELEMENT CANCEL (RESPONSE)>

[BTW: is XPath case-sensitive? ie. should I change //SUB to //sub?]


Can anyone tell me how to change test.php to work with xmlfile_faulty.xml?? 

Regards,

Addam Breen