### 2.2.68 Measure_grouping_engraver

Create `MeasureGrouping` to indicate beat subdivision.

Properties (read)

> `baseMoment` (moment)

>   Smallest unit of time that will stand on its own as a subdivided section.

> `beatStructure` (list)

>   List of `baseMoment`s that are combined to make beats.

> `currentMusicalColumn` (graphical (layout) object)

>   Grob that is X-parent to all non-breakable items (note heads, lyrics, etc.).

> `measurePosition` (moment)

>   How much of the current measure have we had. This can be set manually to create incomplete measures.

This engraver creates the following layout object(s):

MeasureGrouping.

`Measure_grouping_engraver` is not part of any context.

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