VDXtoSVG
If you use MS Visio extensively, and wish to share your visio files on the web, you know how MS has extended XML for Visio. They are impossible to display without special parsing. VDX is not a standard. And nothing would be worse than rasterising a vector drawing. Don’t worry, there is a better solution. Save your visio drawing as a VDX file. Use VDXtoSVG to convert the file to SVG. And it produces excellent results. As you can see from the sample files posted on their site.