2 {| border="1" cellpadding="5" cellspacing="0" align="center"
4 ! style="background: #efefef;" | Name !! style="background: #efefef;" |Description
6 | HistoryManager || Manages a collection of items.
8 | (History) Item || An item of HistoryManager is ''a time-series'' collection of samples; a file or memory array. It's random-accessable, streamable and appendable.
10 | Sample || An entry in history item. It's a record that contains time and value, possibly other fields too.
12 | (Sample)Format || The record type description of a sample.
14 | Collector || Utility that samples a value from data source and writes to history items according to its configuration.
16 | SamplingFormat (class) || Named description how a datasource's item is to be sampled by a collector. Used for Trend's history subscriptions.
18 | Datasource || An information system that has variables. Provides values to Collector utility.
20 | Variable || A variable in a datasource.