[NTG-context] nomarking function in MKIV

Hi, I gather the \nomarking function has been removed from MKIV. All I can find out about this is a note on the Wiki, towards the end of http://wiki.contextgarden.net/MkIV_Differences Unfortunately I don't understand the example given. What I want is to replace things like \chapter{Short Title \nomarking{Rest Of Title}} ....so that "Short Title Rest Of Title" appears as the chapter title, but just "Short Title" appears in the TOC, PDF bookmarks and footers. Thanks, -- John Devereux