Here are the data structures with brief descriptions:
  cmd_hash_item_t | Item of command hash table used for fast command recognition |
| epp_avail | Structure holding answer to EPP check command |
| epp_command_data | This structure is central to the concept of the whole module |
| epp_context | EPP context is a group of variables used often together |
| epp_discl | Disclose information of contact |
| epp_dnskey | DNS Key record - http://rfc-ref.org/RFC-TEXTS/4034/chapter2.html |
| epp_error | The struct represents one epp error in ExtValue element |
| epp_ext_domain_upd_dnssec | DNSSEC extension used for updates |
| epp_ext_enum | |
| epp_ext_item | |
| epp_ns | Nameserver has a name and possibly more than one ip address |
| epp_postalInfo | Structure gathers postal info about contact |
| epp_status | Structure for holding status' names and values |
| epp_testResult | Structure containing result of one technical test |
| epp_zonecredit | Structure holding answer to EPP creditInfo command |
| epps_check | Check contact, domain and nsset parameters |
| epps_create_contact | Create contact parameters |
| epps_create_domain | Create domain parameters |
| epps_create_keyset | Create keyset parameters |
| epps_create_nsset | Create nsset parameters |
| epps_creditInfo | CreditInfo parameters |
| epps_delete | Delete parameters |
| epps_info | All Info functions, which accept single key on input and count on output (domainsByNsset, domainsByContact, nssetsByContact, nssetsByNs) |
| epps_info_contact | Info contact parameters |
| epps_info_domain | Info domain parameters |
| epps_info_keyset | Info keyset parameters |
| epps_info_nsset | Info nsset parameters |
| epps_list | Parameters of obsolete command 'list' and getResults command |
| epps_login | Login parameters |
| epps_poll_ack | Poll acknoledge parameters |
| epps_poll_req | Poll request parameters |
| epps_renew | Renew domain parameters |
| epps_sendAuthInfo | SendAuthInfo parameters |
| epps_test | Test parameters |
| epps_transfer | Transfer parameters |
| epps_update_contact | Update contact parameters |
| epps_update_domain | Update domain parameters |
| epps_update_keyset | Update keyset parameters |
| epps_update_nsset | Update nsset parameters |
| qhead | Queue structure used on countless places throughout the program |
| queue_item_t | Definition of queue item type |
 valerr_ctx | This struct gathers context parameters used by error handler of libxml's validator |
