How solid and safe is block handle in output of ATTOUT?

[pefi]

I'm working on method to transfer content of _some_ block attributes between 2 versions of a drawing. The versions won't be identical, there will be some changes introduced between versions.

I consider using this workflow:

1. Open version 1 of the drawing

2. Use ATTOUT to get content of all attributes to v1.txt file

3. Open version 2 of the drawing

4. Use ATTOUT to get content of all attributes to v2.txt file

5. Merge v1.txt with v2.txt. The attributes that needs to be preserved from v1 are copied over the content of v2.txt, the rest stays as is in the v2.txt

6. ATTIN the v2.txt into the v2 drawing

 

The idea is based on the block handle being preserved for the time life of a drawing (it life of the block really). I got a confirmation, but it was from an AI, so not worth much.

Is the idea right? Are there a better ways to do it?

 

Edit: Confirmation https://help.autodesk.com/view/OARX/2022/ENU/?guid=GUID-08DCE6ED-DE5A-41FA-9220-3D75B2B4C43D 

Edited 9 hours ago by pefi
add ifno about the life of block