This read-create object specifies what kind of ACE this is, per the AceObjectType enumeration, such as an IP-based or a MAC-based classification rule. An admin sets this to tell the device how to interpret the referenced tuples in this ACE, for instance whether the tuple pointers describe IP-header fields or MAC-header fields. For example, an admin building a MAC-address-based access rule would set this field to the MAC ACE type so the device correctly parses the associated tuples as source or destination MAC values rather than IP fields.