Export the relationship information in a mind map?

Hi, I have received a mind map from our partner, which is so overwhelmingly large that we'd like to be able to export both the hierarchy and the relationships into plain texts that we could parse and analyze by writing some code. The hierarchy part is easy to do - I could get that information by exporting the mind map into the html format; but the relationship information seems to be no where to be found in the html format...Could you please let me know if the mind map could be exported into some format where the relationship information could be programmatically extracted?