[NTG-context] \useexternalfigure globally? (+minor issues)

Hi all, [1] in grph-fig.mkiv, “\useexternalfigure” is declared twice in exactly the same way (ll. 124 and 132). [2] “\showexternalfigures” does not seem to work in mkiv (fails at “\startXMLmapping”), is there an alternative? [3] Is there a way to globally declare an externalfigure from inside a group? So that in the following example, the second reference to “kuh” succeeds. ···8<···························································· \starttext \bgroup \useexternalfigure[kuh][cow] \externalfigure[kuh] \egroup \externalfigure[kuh] \stoptext ···8<···························································· Thanks in advance, Philipp