Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4020#discussion_r119222374
--- Diff: docs/dev/table/streaming.md ---
@@ -39,17 +39,293 @@ Dynamic table
Time Attributes
---------------
-### Event-time
+Flink supports different notions of *time* in streaming programs.
-* DataStream: Timestamps & WMs required, `.rowtime` (replace attribute or
extend schema)
-* TableSource: Timestamps & WMs & DefinedRowtimeAttribute
+- *Processing time* refers to the system time of the machine (also known
as "wall-clock time") that is executing the respective operation.
+- *Event time* is the time that each individual event occurred on its
producing device.
--- End diff --
It can be any timestamp that is associate with a row. How about: "Event
time refers to the processing of streaming data based on timestamps which are
attached to each row. For example the timestamps can encode when an event
happened."
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