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> - 4.5: https://docs.nvidia.com/holoscan/sdk-user-guide/4-5/llms.txt
> - 4.4: https://docs.nvidia.com/holoscan/sdk-user-guide/4-4/llms.txt
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# holoscan::detail::schema_attach_mismatch_message

> Format complete expected and local identities for a cold-path attachment diagnostic.

```cpp showLineNumbers={false}
HOLOSCAN_SCHEMA_EXPORT std::string holoscan::detail::schema_attach_mismatch_message(
    const SchemaIdentity &expected_identity,
    const SchemaIdentity &local_identity
)
```

Format complete expected and local identities for a cold-path attachment diagnostic.

> **Note**
>
> A target that instantiates attachment validation must link `holoscan::schema`; this declaration is provided by that compiled library rather than FlatBuffers alone.