One such solution is to use header-line-format to display olpath.
I don't understand this.
In scientific/academic publications, one often sees a list of Keywords in the topmatter. That being said, I am not certain how people use them. There are often a dozen or more.
I have had to throttle back my use of tags, to avoid long header lines. Also, tags are limited to head lines, only.
I would like to implement a secondary list of keywords, that might be searched in an agenda search. I don't know whether properties would be appropriate, although I understand properties can slow the system down. Don't know. Probably something similar to properties.
So, for example, if I am taking notes and indexing video clips or PDFs, a larger number of keywords would enable me to retrieve them in a less structured, free form manner. A custom agenda search would be perfect.
Probably barking up a tree. Probably just better use of tags would solve this problem. Keywords, though, could be implemented outside of headlines. Maybe I should just use more headlines.