OTDR measurement results in like XML or whatever open self documenting format, just not SOR. Or even just in actual standards compliant SOR, if that's all I can get.
An OTDR sends pulses of laser light into a fiber optic cable and records the minute reflections that occur at every point of the cable over time. The time of arrival of the reflections corresponds to the position of where it was reflected. This way you can record the attenuation of an entire cable just from shining in pulses from one end. Good for checking if a new cable was properly installed, or for finding the location of issues in existing cables for debugging.