### 3.2.42 gregorian-ligature-interface

A gregorian ligature.

#### Internal properties:

> `virga` (boolean)

>   Is this neume a virga?

> `stropha` (boolean)

>   Is this neume a stropha?

> `inclinatum` (boolean)

>   Is this neume an inclinatum?

> `auctum` (boolean)

>   Is this neume liquescentically augmented?

> `descendens` (boolean)

>   Is this neume of descendent type?

> `ascendens` (boolean)

>   Is this neume of ascending type?

> `oriscus` (boolean)

>   Is this neume an oriscus?

> `quilisma` (boolean)

>   Is this neume a quilisma?

> `deminutum` (boolean)

>   Is this neume deminished?

> `cavum` (boolean)

>   Is this neume outlined?

> `linea` (boolean)

>   Attach vertical lines to this neume?

> `pes-or-flexa` (boolean)

>   Shall this neume be joined with the previous head?

> `context-info` (integer)

>   Within a ligature, the final glyph or shape of a head may be affected by the left and/or right neighbour head. `context-info` holds for each head such information about the left and right neighbour, encoded as a bit mask.

> `prefix-set` (number)

>   A bit mask that holds all Gregorian head prefixes, such as `\virga` or `\quilisma`.

This grob interface is used in the following graphical object(s): NoteHead.

#### Internals Reference v2.18.2 (稳定分支).