[NTG-context] footnotes in appendices

Dear list, on a document I have, I want to have footnotes in appendices, but they are numbered in uppercase Roman numbers. Here is a sample: \starttext \startappendices a\footnote{b.} \stopappendices \stoptext How can I change it to Arabic numbers? I would be also interested to know how to change chapter and section numbers only for appendices. Many thanks for your help, Pablo -- http://www.ousia.tk