Represents the data defined in xs:group slash in the MusicXML schema.

When a measure-style element has a slash subelement, its slash group subelements are stored in table slash_group. The measure style data is stored in table measure_style, measure_style_type slash, and joined to slash_group using foreign key slash_group_id.

The slash_dots field has the slash-dot subelement count.

Data of the except-voice subelements are stored in table except_voice, foreign key slash_group_id.