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+Some (by no means all) Japanese-related packages are named based on
+the following prefix rule to indicate engine dependency:
+
+ - BX... => works with any engine
+ - PX... => (u)ptex-specific; a few of those work with luatexja too
+ - ZX... => works with xetex only
+
+We hope this helps demystify the naming.
+
+Packages developed outside the Japanese community don't use this
+convention.
+