# ExternalDeclaration

Field in [Declaration](https://docs.yarnspinner.dev/2.0/api/csharp/yarn.compiler/yarn.compiler.declaration)

## Summary

The string used for [SourceFileName](https://docs.yarnspinner.dev/2.0/api/csharp/yarn.compiler/yarn.compiler.declaration/yarn.compiler.declaration.sourcefilename) if the Declaration was found outside of a Yarn source file.

```csharp
public const string ExternalDeclaration = "(External)";
```