>From doc string of svn_wc_diff_callbacks4_t: "Note that @a path is a relative path, not just the basename of the path."
>From merge_file_added() (which implements svn_wc_diff_callbacks4_t.file_added): SVN_ERR_ASSERT(svn_dirent_is_absolute(mine_abspath)); Given that MINE_ABSPATH is the parameter called PATH in the doc string, I think the contradiction is obvious...