Context of Timing windows is not clear

[ASL-rmarshall]

It's not clear from the model or user guide now windowLower and windowUpper should be defined. Taking this example from the UG:

It's not clear which of the following would be correct:

• Define windowing chronologically relative to the Timing's value (i.e., windowLower is always chronologically before value and windowUpper is always chronologically after value):
  • value = P1D
  • windowLower = PT1H
  • windowUpper = PT2H
  • type = Before
  • "A occurs between (1 hour before 1 day before B) and (2 hours after 1 day before B)"
• Define windowing relative to the Timing's value in the context of the Timing's type:
  • value = P1D
  • windowLower = PT2H
  • windowUpper = PT1H
  • type = Before
  • "A occurs between (1 day minus 2 hours) and (1 day plus 1 hour) before B"
• Define windowing chronologically relative to the Timing's relativeFromScheduledInstance:
  • value = P1D
  • windowLower = PT25H
  • windowUpper = PT22H
  • type = Before
  • "A occurs between (25 hours before B) and (22 hours before B)"
• Define windowing relative to the Timing's relativeFromScheduledInstance in the context of the Timing's type:
  • value = P1D
  • windowLower = PT22H
  • windowUpper = PT25H
  • type = Before
  • "A occurs between (22 hours) and (25 hours) before B"

[BSnoeijerCD]

@ASL-rmarshall : The training is clear in this.
WindowLower and WindowUpper are always related to the value. Windowlower is the amount of time before and WIndowUpper, the amount of time after the value.
The reason for this is that otherwise we would need negative values, which is not allowed.

If this is not clear from the IG: then an IG update might be feasible.

The picture link does not work / is not visible.

[ASL-rmarshall]

@BSnoeijerCD I agree that the training (Chapter 4, slide 10) is clear and the descriptions of the windowLower and windowUpper attributes also help:

• windowLower: The earliest chronological value of an allowable period of time during which a temporal event takes place.
• windowUpper: The latest chronological value of an allowable period of time during which a temporal event takes place.

The first option above is the correct one.

However, I do also think it might also be helpful to update the IG to make things clear - maybe by expanding and annotating the diagram above like this (if this is correct):

Timing Windows.pptx