Have you lost any precious files lately? Old movies of your kids when they were young, perhaps. Wouldn’t it be good to be able to recover them?
XML
The macOS Dictionary app may appear dull and unnecessary, but gives offline access to reputable dictionaries completely free of charge.
A hard to spot runtime error results if you try to embed the key < in a dictionary. But when converting plain text for embedding in XML, that's one character you need to substitute.
You want to read in a property list to structured data in Swift. The solution – in Swift 4 – is in a Coder, as explained here.
Described as a WYSIWYG LaTeX for Mac, this app attempts to provide integrated editing of both marked-up text and rendered pages.
Hypertext returns without any hyperbole, and XML could be much more able to cope with the reality of life.
Preference settings have been a problem since the first public beta of OS X. Why have they never been properly sorted out?
Why is XML still so hard to write, and so poorly supported by accessible tools?
How property list files store your preference settings, and how to access additional features.
How can I set up a dictionary of placenames, which I can then access throughout my applications?
The Eclectic Light Company 