# validate_and_get_relationship_type

> **Function** in `langchain_neo4j`

📖 [View in docs](https://reference.langchain.com/python/langchain-neo4j/graph_transformers/llm/validate_and_get_relationship_type)

## Signature

```python
validate_and_get_relationship_type(
    allowed_relationships: Union[List[str], List[Tuple[str, str, str]]],
    allowed_nodes: Optional[List[str]],
) -> Optional[str]
```

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[View source on GitHub](https://github.com/langchain-ai/langchain-neo4j/blob/887064c6bea53318f3507ed07120ea68bfe6a36b/libs/neo4j/langchain_neo4j/graph_transformers/llm.py#L682)