Found in Sierra, but seems to have fallen into disuse, and not found in High Sierra.
macOS
Offline reading is an important feature for many Safari users, particularly on iOS devices and laptop models. So why doesn’t it work?
The Finder manages its tags, so changing the label of any tag is immediately reflected in all items using that tag. But what are null tags, and why are they so common?
Details of where and how files and folders store their Finder Tag information. One of the few xattrs intended for the user.
An arbitrary text headline which can be attached by some creators to documents.
Sometimes used by creators to give a description of the file in plain text.
Gives the normal Finder name of the app which created or edited a file. Doesn’t give its path or signature, though.
Contains a binary date-timestamp for a downloaded file. Valuable for establishing the origins of files.
Now provides complete details of security updates, and simple tools to check for and install any pending updates.
Records the original URL from which a file was downloaded. Valuable for establishing the origins of files.
The Eclectic Light Company 