GetXsdTypeNameForType() function

For a project I'm working on, I need to convert .NET Framework types into XML Schema (XSD) types. I wrote a little function to do the translation:

public static string GetXsdTypeNameForType(Type t)
{
    string rVal = string.Empty;
    switch (t.FullName)
    {
        case "System.Boolean": rVal = "boolean"; break;
        case "System.Byte": rVal = "unsignedByte"; break;
        case "System.Byte[]": rVal = "base64Binary"; break;
        case "System.DateTime": rVal = "dateTime"; break;
        case "System.Decimal": rVal = "decimal"; break;
        case "System.Double": rVal = "double"; break;
        case "System.Int16": rVal = "short"; break;
        case "System.Int32": rVal = "int"; break;
        case "System.Int64": rVal = "long"; break;
        case "System.SByte": rVal = "byte"; break;
        case "System.String": rVal = "string"; break;
        case "System.String[]": rVal = "ENTITIES"; break;
        case "System.TimeSpan": rVal = "duration"; break;
        case "System.UInt16": rVal = "unsignedShort"; break;
        case "System.UInt32": rVal = "unsignedInt"; break;
        case "System.UInt64": rVal = "unsignedLong"; break;
        case "System.Uri": rVal = "anyURI"; break;
        case "System.Xml.XmlQualifiedName": rVal = "QName"; break;
    }
    return rVal;
}

NOTE: There are places where I had to make a decision as to which XSD type would map to System.TimeDate, System.String, System.Byte[], etc. And there's the question of which XSD type I will map to my custom Employee, Appointment or Cow types!