[NTG-context] Punctuation in bibliography

Dear all, is there a way for the bibliography style to scan back for punctuation marks before it inserts punctuation of its own? Please see --- \startpublication [a={Ellen Dissanayake}, k=DIS:wha, t=book, y=1988] \author{Ellen}[E.]{}{Dissanayake} \lang{en} \pubname{University of Washington Press} \pubyear{1988} \title{What is Art for?} \stoppublication \setuppublications [alternative=apa] \starttext \cite[DIS:wha] \placepublications [criterium=all] \stoptext --- It would be great if I could make the full stop after the question mark disappear… Many thanks for any help, Oliver