# How to get access to Header Section instances using SDAI?

 1. [FAQ](/ja/faq)
2. »
3. [STEP](/faq/step)

### Two following SDAI extension functions are declared in sdai.h header:

```plaintext
SdaiInstance _sdaiHeaderDescription(SdaiRep repository);
SdaiInstance _sdaiHeaderName(SdaiRep repository);
```

Then attribute values of instances can be accessed using standard sdaiGetAttrBN/sdaiPutAttrBN functions.

The third instance of FILE\_SCHEMA type can’t be accessed and is filled automatically when writing repository to file.