Liquid XML Studio 2019
Schema Selector (Xml Wizard)

You need to provide a schema to describe the data that you will be mapping, you can do this using by providing an XSD, DTD or XDR.

If you don't have a schema (i.e. you just have an xml data file) then you can infer a schema from the XML data file (see Inferring an XML Schema (XSD)).

If you infer an XSD from an XML document, then you may have to finesse the XSD manually in the XSD Editor.