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Begin
Foundations->Node->Begin->Definition
begin.png
Begin is the datetime at the moment the object represented by the parent node began to exist.
Foundations->Node->Begin->Content
In the context of a candle, it is the datetime of the open of the candle as provided by the exchange.
End
Foundations->Node->End->Definition
end.png
End is the datetime on which the object represented by the parent node ceased to exist. In case the object has not been closed yet, it is the datetime at the moment of evaluation.
Foundations->Node->End->Content
In the context of a candle, it is the datetime of the close of the candle as provided by the exchange.
In every other context, the datetime is given by the datetime of the moment of evaluation. When evaluating a point in time in which the object remains open, end stores the datetime of that moment, because the object existed until that point in time when the value was last being updated. Once the object is closed, the end value is not modified again.
Begin Rate
Foundations->Node->Begin Rate->Definition
begin-rate.png
Begin rate is the close rate of the candle corresponding to the datetime of the begin property.
Foundations->Node->Begin Rate->Content
In the context of a strategy, it is the close rate of the last closed candle at the moment the strategy was triggered.
In the context of a position, it is the close rate of the last closed candle at the moment the take position event was triggered.
In the context of an episode, it is the close rate of the last closed candle at the moment the episode starts.
End Rate
Foundations->Node->End Rate->Definition
end-rate.png
End rate is the close rate of the candle corresponding to the datetime of the end property.
Foundations->Node->End Rate->Content
In the context of a strategy, it is the close rate of the last closed candle at the moment the strategy is triggered-off.
In the context of a position, it is the close rate of the last closed candle at the moment the close stage is closed.
In the context of an episode, it is the close rate of the last closed candle at the moment the episode ends.
Candle
Foundations->Node->Candle->Definition
candle.png
The candle structure of nodes stores the properties that make up each candle in the episode, including open and close datetime, and the rates for open, min, max, and close.
Foundations->Node->Candle->Content
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Accounts Specific to Orders
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Identity and Status

Trading Engine — TOC

You just read page 14 in the topic.

1. Trading Engine Hierarchy

2. Monitoring Runtime Data

3. Trading Bot Output

4. Temporal Context - Current and Last

5. Conceptual Context - Episode, Strategy, Position, Strategy Stages

6. Base Asset and Quoted Asset

7. Counters

8. Statistics

9. Distance-To-Trading-Events

10. Balances

11. Common Metrics - Hits, Fails, Hit Ratio, Profit Loss, ROI, Annualized Rate of Return

12. Accounts Specific to the Open and Close Stages

13. Accounts Specific to Orders

14. Market Data

15. Identity and Status