XSD Validation

[Al Ortega]

I have an xsd file that I use to validate inbound xml files and it works fine as long as the elements are in the same order. But what I would like is for it to validate the element exists rather than it exists in a specific order. For example I want both of these to be validated as true: Smith John - or - John Smith The elements FirstName and LastName under customer need to exist, I just don't care which order they are in. Is there something in the xsd that can be set to make it work this way? Thanks in advance, Al