If you add a blank html using the menus (right click on Text in BookBrowser", then a proper Doctype should be automatically added.
If you run Mend, a proper Doctype should be added.
If you enable Mend on Open then if Doctype is missing in some files, it will fail the well-formed check and allow you to auto fix them.
Only if you use AddExisting a file without a Doctype, or copy and paste in source that is missing a Doctype would you then need to add it manually or simply just run Mend.
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