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

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

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

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.