|The Variations2 Data Model
includes the following entities and relationships:
|The Work represents
the abstract concept of a musical composition or set of compositions.
|It is manifested in the Instantiation,
which represents a manifestation of a work as a recorded performance or a
|The physical level is
represented by the Container, which is the item or set of
item(s) on which one or more instantiations of works can be found, e.g. a CD
or published score.
|This is actually the level
which is most typically represented in the traditional USMARC catalogs.
|Finally, the Media Object
represents a piece of digital media content, such as a sound file or score
image, and Contributors represent people or groups that contribute to
a work, instantiation, or container.