Volume Number
From MusicBrainz Wiki
When a Release is part of a series, the VolumeNumber is the part of the ReleaseTitle that describes the position in the series. It usually takes the form Volume x, but other words are used too.
VolumeNumbers follow VolumeNumberStyle.
[edit] Examples
ReleaseTitle: "Greatest Hits of 1993, Volume 3"
- VolumeNumber: "Volume 3"
ReleaseTitle: "Cool Songs, Chapter Four"
- VolumeNumber: "Chapter Four"
