I am assuming you mean converting the atomic geometry, not the Python file itself? Can you give an example of the xsd file format you need? If so, it would be relatively easy to write some Python code to convert to it, but XSD is more like a type of file format, like XML, so there probably is no standard "XSD atomic coordinate format", at least none I know of.
You might be better off just exporting to XYZ and then importing that data somewhere else...?
