Vista - XSD Scheme validating

hey, i tried a lot of things that i can validate a xml file with a exact
scheme xsd - file, but i only get 1 error message for every element, "the
namespace information for "url:Test" can not be found", i think thats my file
was not correct, but if i tried a msdn example xml file with the exact xsd
file and get the same errors... is that right? - what validate the XmlReader
or XmlValidationReader (NET2.0), can this classes validate the datatypes of
an element? or only the structure of that file

thanks a lot

cryptic