Co-chair meeting minutes: April 10, 2025
MNX
The slur object no longer has a location key. Adrian deleted an example that contained an incomplete slur since it should be reworked into a laissez vibrer tie example in future. The target object is now required for slurs. We have also defined some initial values for line type, which is used by slurs. Together, this addresses discussion #402.
Octave lines are now encoded in an array, like clefs, rather than being embedded in the sequence. The example document has been updated. It is also now possible to specify that the octave line applied only to a single voice, by specifying the voice ID. This closes issue #413. We also elected to specify that octave lines can shift by 1, 2, or 3 octaves; previously this was limited to 2 octaves up or down.
Adrian also made corresponding changes for dynamics, so they are also now stored in an array in the part measure object instead of being embedded in the sequence. This closes issue #408. Adrian has added an example document for dynamics to illustrate this change.
sequence now contains only a handful of object types, which feels good. We agreed that type should be made optional for objects in sequence, defaulting to event, so that we do not need to redundantly encode the type for events, which make up the vast majority of objects in sequences. We also discussed issue #391, and agreed that a new sequence content object should be exposed to provide a common way of describing the content of sequence and tuplet.
Adrian has also changed the duration key within the space object to use a fractional rather than integral value, which makes it more expressive and allows it to specify any valid musical duration. This addresses issue #400.
We talked for a while about grace index, sparked by a discussion about how to differentiate between an octave line that ends before the grace notes before a primary note versus how to include the primary note and all its grace notes. We are leaning towards making the implicit default value of grace index null, which would replace the current default value of undefined.
Next meeting
The next co-chairs meeting is scheduled for Thursday 24 April 2025.