Different RC versions have different marker detections settings

I’ve just noticed that there’s a difference between 1.5.1 and older versions (don’t know starting exactly from which one) marker detection file format. What is this detectMarkersClass used for? Is it a new representation of markerType ? If so, what are the values for other types different from Circular1x12Bit ?
How can I manually change the xml markerType (I could find the types names previously ) to be able to load it to the system without any issues?

Thanks