Did I miss in the recent past some changes in the xmlverbatim API?
Exercising from the manual the macros
\xmldisplayverbatim{#1}{.} and \xmlinlineverbatim{#1}{.}
I get as an error:
! Undefined control sequence.
\startxmlinlineverbatim ... \doinitializeverbatim                                                  
l.4 ] 
\ctxlxml #1->\directlua \zerocount {lxml.#1}                                            
\006>:xmlcommon:pre #1->\xmlinlineverbatim {#1}                                               {.}
l.7 }     
\ctxlxml #1->\directlua \zerocount {lxml.#1}

                                            

This version: ConTeXt  ver: 2012.01.09 10:08 MKIV

Hans van der Meer