=== READER ===

 The abstraction layer providing access to the source data

== Properties ==
 * ''req''
 * ''server''
 * ''srvid''
 * ''dbname''
 * ''opts''
== Methods == 
 * ''!GetGroupInfo([wiki:adeiClassLOGGROUP LOGGROUP $grp] = NULL, [wiki:adeiClassRequestFlags $flags] = 0)''
 [[BR]]Returns information about the specified logging group. If the logging group is not specified, returns the list of all groups in the current data source. If the ''REQUEST::NEED_INFO'' flag is specified, the following properties should be returned for each group:
  * ''first'' - timestamp of the first available record
  * ''last'' - timestmap of the last available record
  * ''records'' - number of records (only if ''REQUEST::NEED_COUNT'' is specified)
  * ''items'' - list of items (only if ''REQUEST::NEED_ITEMS'' is specified)
 * ''!GetItemList([wiki:adeiClassLOGGROUP LOGGROUP $grp] = NULL, [wiki:adeiClassMASK MASK $mask] = NULL, [wiki:adeiClassRequestFlags $flags] = 0)'' 
 [[BR]]Returns list of the items in the specified logging group. The following properties are returned:
  * ''id'' - the position in the group (starting from 0)
  * ''uid'' - unique item name (should be unique within ADEI setup)
  * ''name'' - the short textual name of the item
 * ''!GetRawData([wiki:adeiClassLOGGROUP LOGGROUP $grp] = NULL, $from = 0, $to = 0, [wiki:adeiClassDATAFilter DATAFilter $filter] = NULL, &$filter_data = NULL)''
 [[BR]]Returns the iterator supplying the requested data