#### SeparationItem

SeparationItem objects are created by: Separating_line_group_engraver

Standard settings:

`X-extent-callback` (procedure):
  `#f`

  Procedure that calculates the extent of this object. If this value is set to `#f`, the object is empty in the X direction. The procedure takes a grob and axis argument, and returns a number-pair.

`Y-extent-callback` (procedure):
  `#f`

  see `X-extent-callback`.

This object supports the following interfaces: item-interface, separation-item-interface, spacing-interface and grob-interface

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