Let me take an example of what I mentioned in the title, I have a image of dinning room with a nice table, good chairs, which is stored at http://example.com/static/the-dinning-room.jpg, uploaded by user A in collection "A's dinning room". Then user B came, liked the chairs, the decided to add the pic to his "Nice chairs" collection. Likewise, user C added the pic to his "My favorite tables". Each of them also have new title and description of that very same image.
I definitely don't want to duplicate the file (for many good reasons), but I don't know which one to put to Google image site map . How do I let google know that pic is about dinning room , chairs and table at the same time. Can I just concatenate the title and description from A, B and C ??!!