xdg-mime man page: show how to query all
The xdg-mime man page has an example,
xdg-mime query default image/png
That great. But also show how to get it to show all the all the types it knows about. Not just one.
I.e., sure, the telephone company's directory assistance operator will tell you Bill Norbetston's phone number. But I also sometimes want to see the whole phone book please.