Passage Summary: For a book to be considered 'world literature,' it has to be used by writers in its own country and in other countries as a model, a warning, or a way to improve their own style.

Reasoning: The text defines 'world literature' based on its reception across different national traditions and explains the specific ways authors must engage with a work for it to count as 'interpreted.'

Analysis: This is a formal logic stimulus that sets up a necessary condition for 'world literature.' If a work fails to be interpreted in either its own tradition or an external one, it cannot be world literature. We are looking for a synthesis of these rules, likely focusing on what happens when one of these conditions isn't met. Pay close attention to the 'and' in the first sentence—both internal and external reception are required for the definition to apply.