Document TIFF tags used by imagej

[tfeo]

TIFF tags used by ImageJ are not documented. Here is my use case. Imagej has an awesome overlay feature. I would like to use imagej to display an image with non-destructive overlays showing the results of object detection from the image. The detection is done by my own program. I would like to be able to write TIFF files with imagej-specific tags describing the overlays. I would like in particular to create point overlays with subpixel (float) positioning. Without the documentation of the tags, I have to glean their meaning from the source code, but then I cannot be sure the format won't change.