public static string VerifyTOKEN(string token)
{
if (token == null || token.Length == 0)
{
return token;
}
if (token[0] == ' ' || token[token.Length - 1] == ' ' || token.IndexOfAny(crt) != -1 || token.IndexOf(" ", StringComparison.Ordinal) != -1)
{
throw new XmlException(SR.Sch_NotTokenString, token);
}
return token;
}