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An easy way would be to just extend aXML_WritingDirection_Enum, but then we would write the new attribute value to a non-extension namespace. So special case the new attribute value during both import and export (and only for table cells as a start). Change-Id: I431bf99693c4a3452e91f241bd2f0fcfc72c68fd Reviewed-on: https://gerrit.libreoffice.org/67770 Reviewed-by: Miklos Vajna <vmiklos@collabora.com> Tested-by: Jenkins