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By default it will show all annotations for all locations:
The location and creation time columns will always be filled, they uniquely identify the annotation.
Start time is optional, no start time means the annotation has always been valid in the past.
End time is optional, no end time means the annotation is valid until an undetermined time in the future.
The annotation column shows the actual message for the location, this can be empty but that would only make sense if there would be extra properties defined with it that contain useful information like "Categorie" and or "Sub-Categorie"