#### separation-spanner-interface

A spanner that calculates spacing constraints ("rods") using the `separation-item-interface` grobs in `elements`.

##### User settable properties:

`padding` (dimension, in staff space)
  Add this much extra space between objects that are next to each other.

##### Internal properties:

`elements` (list of grobs)
  list of grobs, type depending on the Grob where this is set in.

This grob interface is used in the following graphical objects: SeparatingGroupSpanner

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