- If an element type hasn't been defined, the user isn't prompted unless it is a similar size to existing types (a side effect from another process). We don't want to prompt the user for everything because of slurs etc. A second pass after beams/slurs etc are detected could work.
- A new pass for each new element should result in the minimum number of user prompts.
- Detecting phrases etc underway. Checking that geometry contains a curve (maybe no line) and that start point equals end point. Yet to check that element spans a couple of notes or a note near stave end. Not having elements grouped by line may make this difficult, but finding curve orientation and having note stem direction will help.