Syncrepl for AD replication

Hi, I am looking to setup a LDAP server that can pull certain user attributes from Active Directory like userid (sAMAccountName), cn, sn and populate some other attributes like public keys via user input. Is it possible to automate the AD to LDAP replication using syncrepl? Also, looking at syncrepl documentation, it isn't clear how syncrepl adds records? For example, if a new user gets added on the master, how does the replica know what objectclasses to include while adding that user? Thanks, Siddhartha