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Looking at the whole data model at once can be overwhelming, so we'll consider it as a few smaller simpler systems:
- Bibliographic metadata
- Licensing
- Works
- Custom lists
- Libraries
- Patrons
- Site configuration
- Background processes
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For the sake of simplicity, this document will talk about "books", but the rules are the same for audiobooks and other forms of content.
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Bibliographic information is information about books as opposed to the books themselves. A book's title, its cover image, and its ISBN are all bibliographic information--the text of the book is not. Bibliographic information flows into the circulation manager and metadata wrangler from a variety of sources, mainly OPDS feeds and proprietary APIs. We keep track of all this information and where it came from, and when necessary we weigh it, sort it, and boil it down into a small amount of information that can be used by other parts of the system.
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