UTS #22, "Unicode Character Mapping Markup Language" has been stabilized: There are no plans to ever publish another update for it.
[2] UTS #22: CharMapML () http://www.unicode.org/reports/tr22/tr22-8.html
[3] Microsoft Word - Beyond UTR22.doc - BeyondUTR22_pdf.pdf, , https://software.sil.org/downloads/r/teckit/BeyondUTR22_pdf.pdf