(BUCS+6578): New abstract node.

(BUCS+6578): New abstract node.
(U+6570): Apply new conventions for glyph granularity; add
`<-denotational' for BUCS+6578.
(HNG-KHI04040): Use BUCS+6578 instead of U+22FD9 as the mother.
(A-IWDSU+6578): New abstract node; use `<-denotational' for BUCS+6578.
(U+6578): Apply new conventions for glyph granularity; add
`<-denotational' for A-IWDSU+6578.
(U-00022FD8): Use `->denotational' and `->subsumptive'.
(U-00022FD9): Add `<-denotational' for A-IWDSU+6578; add
`ideographic-structure'.
(IU+22FD9): Omit `=>ucs@iwds-1'.