In the 9/26/19 PrintTalk meeting, we decided that it was wrong that the current PrintTalk spec requires that xmlns:xjdf is in the PrintTalk root element.
In section 1.2.1 Use of XML namespaces:
If a PrintTalk instance contains items from the XJDF namespace, then the XJDF namespace SHOULD
SHALL be declared in the
PrintTalk element using the standard @xmlns attribute and SHOULD conform to the recommended use of prefix identifiers
as specified in [XJDF 2.0].