Merge command: [strheader-htmltagattributes ]
Merge variable/item: strheaderhtmltagattributes

Comments:
The attributes to be generated within the html tag. The setting is present on the website document in item ntf_xmlNamespace.

Formula:
@text(strheaderhtmltagattributes)

Example:
xmlns="http://www.w3.org/1999/xhtml" or "lang=nl"