LilyPond program-reference: 3.2.86 separation-item-interface

### 3.2.86 separation-item-interface

Item that computes widths to generate spacing rods.

#### User settable properties:

> `X-extent` (pair of numbers)

>   Hard coded extent in X direction.

> `horizontal-skylines` (unknown)

>   Two skylines, one to the left and one to the right of this grob.

> `padding` (dimension, in staff space)

>   Add this much extra space between objects that are next to each other.

#### Internal properties:

> `conditional-elements` (unknown)

>   Internal use only.

> `elements` (unknown)

>   A list of grobs; the type is depending on the grob where this is set in.

This grob interface is used in the following graphical object(s): NonMusicalPaperColumn, NoteColumn, PaperColumn and SeparationItem.

#### Internals Reference