The XSD Validator action performs an XSD validation against data in a file or in an input field.
XSD is short for XML Schema Definition.
As such, there are 2 entities at work here:
The XML you want to validate the layout for
The XSD (Schema) file that describes what the XML file should look like.
See also the XSD Validator pipeline transform.
Workflow action name
The name of the workflow action. Note: This name has to be unique in a single workflow. A workflow action can be placed several times on the canvas, however it will be the same workflow action.
XML File name
The name of the XML file
XSD File name
The name of the XSD file