Validating against xsd
The error messages will appear in the bottom part of the XMLFox Advance interface.
Therefore an XSD schema cannot work that has UPA ambiguity.
XML XSD Schema has the power of possibility to provide the standard structure for XML attributes and elements, through its support for namespaces and datatypes.
You have to validate your XML file to make sure it fits to your application's needs to prevent any exception in your code.
The other compliant products will exhibit similar behavior.
If we look at the sibling declarations of xs:element (with name="a") and xs:any, then that is an example of UPA violation in XSD 1.0 language (it's not a UPA violation in XSD 1.1, as we'll discuss later).