I have been working on Unicode Normalization for NFKC. In section 1.3 I found the following line-
For NFKC or NFKD, one does a full compatibility decomposition, which makes use of canonical and compatibility Decomposition_Mapping values.
From where I can get canonical and compatibility Decomposition_Mapping values?
According to http://old.kpfu.ru/eng/departments/ktk/test/perl/lib/unicode/UCDFF301.html, the 5th field on the following file contains the Decomposition_Mapping values: