The DDX reference guide notes that the Assembler service can not help you create Navigation Welcomepages or Navigation Headers. It suggests you create these using Acrobat and then reference them in your DDX. It also states that the source of either of these can be a PDF or XML file. The example below is taken directly from the DDX reference. I have a process that builds DDX dynamically at runtime. If I can do the same for the XML (myXMLWelcomePage or myXMLHeader), I'll have the ability to create text dynamically and display it in my Navigation Header.