Find/Change dialogue: what is Publisher?

[K.Daube]

In the Find/Change dialogue under Find we can select from Anchored Frame to Variable of Name.

Amidst this long list of objects there is Publisher.

What is this?

A leftover of Macintosh times?

[LinSims]

If the Help is to be believed, Publisher is a metadata element used in DITA. Weird they'd include that in the unstructured interface. Although maybe they didn't ... they messed up the menu.cfg file bigly for the intial release of FrameMaker 2020 unstructured. I haven't had a chance to install the beta to see if that carried over.