GROUP</td><td>Hash of saved DEL_GROUP entries</td></tr>

<tr><td>SAVE_NEW_VALUE</td><td>Hash of new value information which was overwritten after
    a call to SaveNewValues()</td></tr>

<tr><td>SET_GROUP0</td><td>Value to use for family 0 group name when new tags
    are found</td></tr>

<tr><td>SET_GROUP1</td><td>Value to use for family 1 group name when new tags
    are found.  May start with a '+' sign to add to existing group name</td></tr>

<tr><td>SubfileType</td><td>SubfileType for current EXIF IFD 