Sorry to insist, but this bug is blocking the publication of our latest book: \def\Some#1{#1} \def\Sindex#1{\index{\Some{#1}}#1} \starttext \index{Tufte}\index{Knuth}\index{Zapf} \index{Sole}\index{Some}\index{Sone} \input tufte \Sindex{Tufte} \input knuth \Sindex{Knuth} \input zapf \Sindex{Zapf} \placeindex \stoptext The generated index sorts everything that is indexed via \Sindex{} after "Some". In the book, I’m using ConTeXt’s abbreviations (synonyms) mechanism and resolve them with \infull, so that all the organizations are sorted after "infull". I don’t understand what’s going on in strc-reg.mkiv or strc-reg.lua, but I guess the problem might be in local function filtercollected - or does some interpolation take place within \index (\register[something]) itself? Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD