There are caches in my area that have additional logging requirements. That is, they are like traditional caches (a container with a log book at the posted coordinates), but the owner won't allow you to log a find until you do something extra (e.g., post a photo, send owner email).
To my mind, these are more like puzzle/mystery/unknown caches than traditional caches, because you can't just go to the coordinates, find the container, sign the log, and log a find on geocaching.com. With most puzzle/mystery/unknown caches, the "something else" you need to do is to solve the puzzle to get the cache coordinates. With caches with additional logging requirements, the "something else" you need to do is whatever the owner requires.
The official guidelines say that mystery/puzzle/unknown caches are the "catch-all" of cache types, but they also say that the container for mystery/puzzle/unknown caches is not at the posted coordinates. So what about caches with a container at the posted coordinates, but with additional logging requirements?
Here are a few options that I see:
add a new type for "additional logging requirements" caches
add a new attribute for "additional logging requirements"
update the official guidelines to clarify that mystery/puzzle/unknown caches are the "catch-all" of cache types, and that the container for these caches is usually not at the posted coordinates
update the official guidelines to clarify that mystery/puzzle/unknown caches are not the "catch-all" of cache types, but are for caches where the container is not at the posted coordinates
Any other thoughts?