I have a web service that uses XML serialization. I have noticed, that some of the elements in my input class are missing in the XML that WCF Test Client sends. I get to fill everything in in the Formatted tab, but it isn't there in the XML tab (and it is null when it arrives in the web service). Anyone who know what might be wrong? At first I thought it was because it was "nilable=yes" and had MinOccurs=0, but even when I removed that it still didn't appear. Thanks in advance