#### vaticana-ligature-interface

A vaticana style gregorian ligature

##### User settable properties:

`glyph-name` (string)
  a name of character within font.
`thickness` (number)
  Bar line thickness, measured in `linethickness`.

##### Internal properties:

`add-cauda` (boolean)
  does this flexa require an additional cauda on the left side?
`add-join` (boolean)
  is this ligature head joined with the next one by a vertical line?
`add-stem` (boolean)
  is this ligature head a virga and therefore needs an additional stem on the right side?
`delta-pitch` (number)
  the interval between this and the next note, or, more precisely, their vertical distance; this is used in ligatures for calculation of the height of vertical joins flexa shapes
`flexa-height` (dimension, in staff space)
  height of a flexa shape in a ligature grob in staff_space.
`flexa-width` (dimension, in staff space)
  width of a flexa shape in a ligature grob in staff_space.
`ligature-primitive-callback` (procedure)
  callback that brews ligature head.
`x-offset` (dimension, in staff space)
  Extra horizontal offset for ligature heads.

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

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