urlyy commented on issue #2145:
URL: https://github.com/apache/fory/issues/2145#issuecomment-3066873116

   @chaokunyang 
   Hi, I have some confusion about the document during implementating `Extended 
Type Meta with Inheritance support`. I'm not sure if the `meta header` is 
actually the `global binary header`. 
   
   <img width="758" height="645" alt="Image" 
src="https://github.com/user-attachments/assets/86470102-51da-4b04-8b36-932712ee2627";
 />
   
   If the `meta header` is indeed the `meta header`, then the position of the 
`num_class` field seems incorrect. If the `meta header` is the `global binary 
header`, then the fields originally in the "global binary header" would be 
missing. I'm confused about this.
   
   In addition, based on my understanding, `layer` represents the inheritance 
hierarchy level, so `3` layers means the current class includes two parent 
classes (making `num_class` equal to `3`). Is that correct?
   


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