Read Geospatial XML string The Bing Maps V8 Web control can be presented a string, file or URL containing geospatial XML file to show on the map

Read and Write GeoXML THese two samples show how to load GeoXML into a GMLXMLLayer and how to export shapes from the map as GeoXML

Read, Edit and Write GeoJSON THere are multiple samples on how you can load, manipulate and save GeoJSON files in the Bing Maps V8 Control.