Hi, Is it possible to modify or extend org-export-document-properties on the go? And would it be OK? From the docstring of ox-version version of document-properties I would say 'yes'. I'm not sure when reading the docstrig of org-element version.
Or should org-element-parse-secondary-string be used with appropriate limitations? It would be useful 'cause it's an easy way to have a property parsed. In ox-koma-letter.el it would make sense to make #+SUBJECT a document property (ATM org-syntax isn't interpreted). In some backends it would probably also make sense to make #+KEYWORDS parsed. I'm also working on a patch to add #+SUBTITLE, which would also benefit from being easily added as a document-property. —Rasmus -- Lasciate ogni speranza, voi che leggete questo.
