[NTG-context] metapost to pdf on the fly

I would like to generate metapost figures in separate pdf-files (in some convenient directory, they are reused elsewhere). This as part of a project structure. I know that on a separate run such a pdf can be generated with: context figurefile running on input \input some-metapost-inclusions \starttext \startMPpage .. \stopMPpage \stoptext But the idea is to do it on the fly while typesetting a project (using mode=*first to prevent further iterations): .. \component figurefile .. And in the figurefile \startcomponent figurefile \environment some-metapost-inclusions \starttext .. BUT THEN WHAT? As such it is not sufficient for the goal proposed. Can this be done at all? Hans van der Meer