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update metadata transfer
function document.transfer_metadata(name)
local main_doc = lpdf.epdf.load(name)
lpdf.addtocatalog("Lang", lpdf.unicode(main_doc.Catalog.Lang), lpdf.string(main_doc.Catalog.Lang)) lpdf.addtoinfo("Title", lpdfcontext.unicode(setupinteraction{ title = main_doc.Info.Title))} lpdf.addtoinfo("Subject", lpdfcontext.unicode(setupinteraction{ subtitle = main_doc.Info.Subject))} lpdf.addtoinfo("Author", lpdfcontext.unicode(setupinteraction{ author = main_doc.Info.Author))}
lpdf.epdf.unload(name)
end
