[XML-SIG] A Q About DOCTYPE manipulation

[Mariappan, MaharajanX]

Hi,

I'm using minidom to parse the xml file. I'm unable to specify a line like
this
<!DOCTYPE Product SYSTEM "master_test.dtd">
in the XML file i'm creating.

Also the for the DocumentType Objects i'm unable to get or set the publicId
(master_test.dtd??)
How do I set the SYSTEM attribute so that i can point it to a dtd file?
Also after creating the xml object when i make a call to "toxml()" the
DocumentType is not printed?
How can i parse the publicID and write it using minidom (dtd value)?
thanks