Missing class identification- validating datasets

While validating datasets along with a define of 2.1, the validation report is not identifying the classes of custom domains as well as supplemental qualifier domains. Whereas if I run the validator with a define of 2.0 or without define it identifies the class. I am having a question as to whether it's some data that I am not providing in my define 2.1.xml that is causing this or shouldn't it identify regardless since its identifying without define present.