location of mime.*

[Matt L]

Historical documentation points to mime.(types|convs) living in /etc/cups, but ubuntu ships with these files in /usr/share/cups/mime (as well as other files).  I haven't found any documentation explaining how cups locates these configs, and it doesn't appear to be necessary (possible?) to configure it manually.  Does it search both locations, or only one?  Does one location override the other if the file exists in both?