Since pkg-query has a lot of useful little examples, it might be smart to add a note about using the example of "pkg query -e '%a =0' %o" to generate the contents of the 10amd64-local-workstation-pkglist used as an example for documentation. This example from pkg-query generates a list of all the packages that don't have the automatic flag, which means they're dependencies for something the user installed.
I will write a diff for this and submit it to reviews.freebsd.org instead.