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## 9.1. Main concepts

Here follows a short explanation of all different methods that can modify or add to a traversal description.

- Expanders— define what to traverse, typically in terms of relationships direction and type.
- Order— for example depth-first or breadth-first.
- Uniqueness— visit nodes (relationships, paths) only once.
- Evaluator— decide what to return and whether to stop or continue traversal beyond the current position.
- A starting node where the traversal will begin.

See Section 9.2, “Traversal Framework Java API” for more details.

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