public void FromXml ()
{
PublisherIdentityPermission p = new PublisherIdentityPermission (PermissionState.None);
SecurityElement se = p.ToXml ();
Assert.IsNotNull (se, "ToXml()");
p.FromXml (se);
se.AddAttribute ("X509v3Certificate", x509.GetRawCertDataString ());
p.FromXml (se);
Assert.AreEqual (x509.GetCertHashString (), p.Certificate.GetCertHashString (), "CertificateHash");
}