Dear list,

I want to typeset an extensible arrow as described in this document: http://dl.contextgarden.net/myway/matharrows.pdf <http://dl.contextgarden.net/myway/matharrows.pdf> 
Sadly I get errors if I use \xrightarrow (even this simple command does not work).

Do extensible arrows still exists in ConTeXT and how can I use them?

Best
Mathias