in the document https://wiki.contextgarden.net/images/8/8c/xhtml.pdf
near the end an essential line got truncated:
\startxmlsetups xml:img \placefigure[here] [\xmlatt{#1}{src}] {\xmlatt{#1}{alt}} {\externalfigure[\xmlatt{#1}{src}][width=\ctxlua{getmeas("\xmla \stopxmlsetups
how should this line continue ? {\externalfigure[\xmlatt{#1}{src}][width=\ctxlua{getmeas("\xmla
.F