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Each Subject may be associated with a Genre. When LicensePools are turned into Works, all the related Classifications are gathered together. We then assign the Work to the Genre that showed up the most.

A Genre may also be associated with one or more Lanes -- this is the primary technique we use when choosing how to show books to patrons.


Measurement

A Measurement is a numeric value associated with an Identifier.

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  1. We'd create an Identifier for the ISBN "97812345678".
  2. We'd create a Resource for http://example.org/covers/my-book.png
  3. We'd create a Hyperlink with the rel "http://opds-spec.org/image", for "cover image". The .data_source of this Hyperlink would be set to the DataSource that made the original claim.
  4. We don't have to actually download http://example.org/covers/my-book.png, but if we do decide to download it, the binary image will be stored as a Representation. If there's a problem and we can't complete the download, that fact will be stored in the Representation instead.
  5. If we download the image and everything goes well, we may also decide to create a thumbnail out of it. This would be stored as a second Representation, and its .thumbnail_of would point to the original, full-size Representation.

ResourceTransformation

A ResourceTransformation represents a change that was made to one Resource to generate another Resource.

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