Greetings! One can can set register levels with keys and entries \setregisterentry[MyIndex] [keys:1=Sorting Key Level 1, entries:1=Entry Level 1, keys:2=Sorting Key Level 2, entries:2=Entry Level 2] Rewriting the code in lua works until colon (:) is used. \startluacode context.setregisterentry({ "MyIndex" }, { keys:1="C Level 1", entries:1="C Level 2"}) \stopluacode which stops with error: <name> expected near '1' Can the colon be escaped or underlying \xdef\currentregisterkeysa{\registerparameter{\c!keys:1}}% \xdef\currentregisterkeysb{\registerparameter{\c!keys:2}}% \xdef\currentregisterkeysc{\registerparameter{\c!keys:3}}% redefined? Tried without success. MWE (mkiv, latest beta) attached. Thank you, Jano