You can remove it. Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC kris@eberleinconsulting.com Skype: kriseberlein; voice: +1 (919) 622-1501 From: oXygen-user <oxygen-user-bounces@oxygenxml.com> On Behalf Of Frank Dissinger Sent: Wednesday, March 22, 2023 10:38 AM To: Oxygen User Mailing List <oxygen-user@oxygenxml.com> Subject: [oXygen-user] Do I need a namespace declaration in dita root elements? Hi all, I am cleaning up DITA files created with FrameMaker. FrameMaker has added a lot of unnecessary attributes, for example. Among others, FM has added an xmlns:ditaarch attribute to every top-level dita element such as concept, task or reference. Example: <concept id="id187JBI00EHS" xml:lang="en-US" xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/"<http://dita.oasis-open.org/architecture/2005/>> Can I safely remove this attribute or is it required? Regards, Frank -- Frank Dissinger Documentation Manager .................................................................... CGS Publishing Technologies International GmbH Email frank.dissinger@cgs-oris.com<mailto:frank.dissinger@cgs-oris.com> | Web www.cgs-oris.com<http://www.cgs-oris.com/> Address Kettelerstr. 24 | D-63512 Hainburg | Germany Phone +49 6182 9626-27 | Fax +49 6182 9626-99 Commercial register Offenbach, HRB no. 21495 Managing directors Bernd Rückert, Christoph Thommessen [https://www.cgs-oris.com/Signatur.png]<https://www.cgs-oris.com/signatur>