---
source: crates/graphql-composition/tests/composition_tests.rs
expression: Federated SDL
input_file: crates/graphql-composition/tests/composition/subgraph_defining_join__Graph/test.md
---
- ⚠️ [bad]: Unknown directive `@graph` at `join__Graph`
- ❌ [bad] Definition name `join__Graph` is a reserved federation definition name, it cannot be defined in subgraphs.