How to merge a large set of polygons with Boost Polygon?

I am looking for a way, using Boost Polygon, to read in a large set of polygons from a file, and output the resulting m开发者_开发问答erge or union to a result file. In this case the polygons touch but do not overlap. I can put the data in any format. Not sure if there is a standard used by Boost Polygon. I am also looking for more documentation on the library. Any help would be appreciated. Thanks