Is there a schema file for the XML reported from PDF documents?

Unfortunately we don’t have XML schema for XML output.

The PDF to XML returns the text elements in your document. The element contains information such as the text itself, font name, font size, font style, color, x & y coordinates, width, and height.

However you can easily test your documents to see the XML output generated from them using trial version of the sdk which is available at https://bytescout.com/download/web-installer