#### Ottava_spanner_engraver

Create a text spanner when the ottavation property changes..

Properties (read)

`ottavation` (string)
  If set, the text for an ottava spanner. Changing this creates a new text spanner.

This engraver creates the following layout objects: OttavaBracket.

`Ottava_spanner_engraver` is part of contexts: GregorianTranscriptionStaff, Staff, TabStaff and VaticanaStaff

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