XML Schemas

1) Write an XML file
2) Click on "XML" -> "Create Schema"

However, you need to make sure the XML file has every possibility i.e. for a field to be optional you must put the same element twice, once with the data and once without... Which is why the guy writing the article suggests that you start with the XSD file -> You can easily miss something when generating from XML, so you need to at least check that the XSD is what you intended for it to be