Reason behind "OPENLDAP_2.200" version number for openldap 2.6 version?

[thrivikram . rage]

Hi There ,

Is there any reason behind "OPENLDAP_2.200" version number for openldap 2.6 
version ? , 
For earlier versions of  "openldap 2.5.7 " the generated file was 
"OPENLDAP_2.5.7".

Thanks,
Vikram