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Siddhi Inbuilt windows in wiki format

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Syntax	`<event> timeBatch(<int\|long\|time> windowTime)`
Extension Type	Window
Description	A batch (tumbling) time window that holds events that arrive during `windowTime` periods, and gets updated for each `windowTime`.
Parameter	`windowTime` : The batch time period for which the window should hold events.
Return Type	Returns current and expired events.
Examples	`timeBatch(20)` for processing events that arrive every 20 milliseconds. `timeBatch(2 min)` for processing events that arrive every 2 minutes.

Syntax	`<event> length(<int> windowLength)`
Extension Type	Window
Description	A sliding length window that holds the last `windowLength` events at a given time, and gets updated for each arrival and expiry.
Parameter	`windowLength` : The number of events that should be included in a sliding length window.
Return Type	Returns current and expired events.
Examples	`length(10)` for processing the last 10 events. `length(200`) for processing the last 200 events.

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Syntax	`<event> firstUnique(<string> attribute)`
Extension Type	Window
Description	First unique window processor keeps only the first events that are unique according to the given unique attribute.
Parameter	`attribute` : The attribute that should be checked for uniqueness.
Return Type	Returns current and expired events.
Examples	`firstUnique(ip)` returns the first event arriving for each unique `ip`.

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Syntax	`<event> externalTimeBatch(<long> timestamp, <int\|long\|time> windowTime)`
Extension Type	Window
Description	A batch (tumbling) time window based on external time, that holds events arrived during `windowTime` periods, and gets updated for every `windowTime`.
Parameters	`timestamp` : The time which the window determines as current time and will act upon. The value of this parameter should be monotonically increasing. `windowTime` : The batch time period for which the window should hold events.
Return Type	Returns current and expired events.
Examples	`externalTimeBatch(eventTime,20)` for processing events that arrive every 20 milliseconds from the `eventTime`. `externalTimeBatch(eventTimestamp, 2 min`) for processing events that arrive every 2 minutes from the `eventTimestamp.`

Syntax	`<event> timeLength(<int\|long\|time> windowTime, <int> windowLength)`
Extension Type	Window
Description	A sliding time window that, at a given time holds the last `windowLength` events that arrived during last `windowTime` period, and gets updated for every event arrival and expiry.
Parameters	`windowTime`: The sliding time period for which the window should hold events. `windowLength`: The number of events that should be be included in a sliding length window.
Return Type	Returns current and expired events.
Examples	`timeLength(20 sec, 10)` for processing the last 10 events that arrived within the last 20 seconds. `timeLength(2 min, 5)` for processing the last 5 events that arrived within the last 2 minutes.

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