- /* Compare the private data for the attributes of two files. If
- they are the same, in the sense that they could be linked
- together, return NULL. Otherwise return an error message. */
- const char *(*attributes_compare) (void *, void *, int *err);
+ /* Merge the private data for the attributes of two files. If they
+ could be linked together, return NULL. Otherwise return an error
+ message. */
+ const char *(*attributes_merge) (void *, void *, int *err);