This morning, I tested a hierarchical keywords (again) and found that both Capture One and Lightroom
- include the complete hierarchy flattened under the dc:subject tag, no matter if I add the complete hierarchical path or just the leaf keyword
- include, in the hierarchical tag, one line per keyword that is shown in the keyword field, e.g.
root|branch|leaf…if only the leaf is visible in the keyword field of the GUI
or
root
root|branch
root|branch|leaf…if all levels are shown.
This seems to be “industry standard” notation and I propose that DPL should go along with that.