[NTG-context] Marking a textfragment for later reference

Dear list, How can I refer to some text, for example a discussion of a particular topic, on another page or in another chapter of my document with, for instance "(See discussion on page xx)"? I tried to do this by marking the relevant text as a delimited text without altering its layout: \definedelimitedtext[topica] \setupdelimitedtext[topica][left=,right=] %maybe superfluous? \starttopica some text \stoptopica and then, further on, referring to that text with (See discussion on \at{page}[topica]) But this does not work (mkiv 27-07). Thanks in advance for any advice. Best regards, Robert Blackstone