Why use "." in the struct in this way?

[lx <lxlenovostar@xxxxxxxxx>]

hi all:

       why use the struct in this way by "."

for example, .owner instead of owner , why? 

Thank you.

1203 static struct file_system_type ext2_fs_type = {
1204         .owner          = THIS_MODULE,
1205         .name           = "ext2",
1206         .get_sb         = ext2_get_sb,
1207         .kill_sb        = kill_block_super,
1208         .fs_flags       = FS_REQUIRES_DEV,
1209 };
1210 

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