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Thema coding is less restricted. Obviously if the book is Fiction then the main subject must be a Fiction code – retailers and consumers have to be able to differentiate between fiction and nonfiction – but having identified the book Abraham Lincoln, Vampire Hunter by Seth Grahame-Smith as a Fiction: mashup, you might well use coding that included
| Main Subject | Subject Code | Qualifier Code | Heading |
|---|---|---|---|
| FYM | Fiction: mashup | ||
| FK | Horror & supernatural fiction | ||
| DNBH1 | Autobiography: historical, political & military | ||
| 3MNQ-US-E | American Civil War and Reconstruction (1861–1877) | ||
| 1KBB-US-SEC | District of Columbia (Washington D.C.) | ||
| NHTS | Slavery & abolition of slavery |
Used appropriately and with clarity any code can be combined. Remember that a retailer or a consumer has to be able to use the classification, it must be accurate, and practically you are more likely to use non-fiction codes to add depth to fiction than the reverse, but Thema coding allows flexibility
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