Regarding the changes I made to the test schema: I looked up the schema here http://www.datypic.com/sc/ooxml/s-dml-chart.xsd.html and added the xsd:unsignedShort to the union statement, as both of the types in question are listed as being derived from xsd:unsignedShort. I have left in the percent sign types in the union, figuring that this would allow for some backwards compatibility in validation, however let me know if you would like me to update that schema. I'm just not really sure what it's properly supposed to be.