Our next priority will be finalizing the specification of BIDS-Derivatives[/url]. Please feel free to review [url=https://bids-specification.readthedocs.io/en/common-derivatives/05-derivatives/01-introduction.html]the draft[/url] and comment. The specification of spatial references, in particular composite surface/volume spaces, remains an [url=https://github.com/bids-standard/bids-specification/pull/301]open question with room for expert review.