Suppose you have the following DTD declaration:

<!DOCTYPE abc  [<!ELEMENT abc (#PCDATA)> <!ELEMENT data (#PCDATA)> <!ELEMENT inner_data (#PCDATA)>]>

The following PowerScript sets the system ID and then gets
it and returns it in a message box:

PBDOM_DOCUMENT pbdom_doc
pbdom_doc.GetDocType().SetSystemID &
   ("http://www.sybase&.com/dtd/datadef.dtd")
MessageBox ("Get System ID", &
   pbdom_doc.GetDocType().GetSystemID())

The returned string from the GetSystemID call
is:

"http://www.sybase.com/dtd/datadef.dtd"

The final DOCTYPE definition in the document is:

<!DOCTYPE abc SYSTEM "http://www.sybase.com/dtd/datadef.dtd"[<!ELEMENT abc (#PCDATA)> <!ELEMENT data (#PCDATA)> <!ELEMENT inner_data (#PCDATA)>]>