Node: spacing-interface, Next: spacing-spanner-interface, Previous: spaceable-grob-interface, Up: Graphical Object Interfaces
Something to do with line breaking and spacing. Kill this one after determining line breaks.
This grob interface is used in the following graphical objects: StaffSpacing, SpacingSpanner, SeparationItem, SeparatingGroupSpanner and NoteSpacing
This page is for LilyPond-2.0.1 (stable-branch).