Namespace Declaration in Data Model - BI 12.2.1.3.0 / 12.3.1.4.0

Some downloaded data model (.xdm) files seem to use a global/default namespace declaration, with the namespace only declared in the dataModel start-tag. Other downloaded data model files include the namespace declaration in all start-tags.

What setting in Bi-Publisher controls the use of a default namespace declared in only the dataModel start-tag verses the namespace being declared in all start-tags?

Excerpt from xdm file with default namespace declared in the dataModel start-tag only:

<?xml version = '1.0' encoding = 'utf-8'?>

<dataModel xmlns="http://xmlns.oracle.com/oxp/xmlp" version="2.0" xmlns:xdm="http://xmlns.oracle.com/oxp/xmlp" xmlns:xsd="http://wwww.w3.org/2001/XMLSchema