Hi, Various documents mention a namespace feature for references by setting prefix=+. This is a really cool feature but I cannot get it to work. Why does the following example not work: \setupinteraction[state=start] \setuphead[chapter][prefix=+] \starttext \startchapter[reference=chap1,title={First Chapter}] \startsection[reference=sec1,title={First Section in First Chapter}] Reference \type{sec1} is \about[sec1].\par Reference \type{chap2:sec1} is \about[chap2:sec1].\par \stopsection \stopchapter \startchapter[reference=chap2,title={Second Chapter}] \startsection[reference=sec1,title={First Section in Second Chapter}] Reference \type{sec1} is \about[sec1].\par Reference \type{chap1:sec1} is \about[chap1:sec1].\par \stopsection \stopchapter \stoptext Any help is appreciated. Christoph Reller