<linesp>

>--+--- noun ---.
   |            |
   |--- sign ----+--- name -----.
   |                           |
   ‘--- <id> ---+--- noun -----|
                |              |
                |--- sign -----| .-----------------------------------------.
                |              |/                                          |
                ‘--------------*--- word ----------------------------------|
                               |                                           |
                               |--- TEXT --- text -------------------------|
                               |                                           |
                               |--- EXTRA --- :uda_name --- uda_setting ---|
                               |                                           |
                               |--- COMMENT --- text ----------------------|
                               |                                           |
                               |--- <uval> ---+--- comma --- <uval> ----.  |
                               |              |                         |  |
                               |              ‘-------------------------+--|
                               |                                           |
                               |--- sign ----------------------------------|
                               |                                           |
                               |--- <id> ----------------------------------’
                               |
                               ‘--->