Liquid XML Studio 2019
Select Data Source (Xml Source Wizard)

The next section allows you to specify where you want your source data to come from. This is the data that will be mapped when your transform executes. If you inferred a Schema from source XML, you may wish to use this here. If you specified an XSD you already had before starting your mapping project, you can use it to generate default XML data to use in the Mapper.