Adrian has also created a pull request for the support element, which in the first instance is intended to specify whether the document encodes the visibility of accidentals (pull request #347). The field useAccidentalDisplay defaults to false, i.e. by default it is assumed that the consuming application is expected to use its own algorithmic approach to determining where accidentals should appear. If the document does not have useAccidentalDisplay set to true, but then nevertheless specifies accidentalDisplay for one or more notes, we have specified that will be invalid MNX; we are not yet sure whether we can make the JSON schema complain about this issue, but we will look into it. We welcome community feedback on this pull request before we merge it.