public bool HasChanged()
{
bool retVal = false;
if (!String.IsNullOrEmpty(this.uriAttribute))
{
retVal = true;
}
if (!String.IsNullOrEmpty(this.responderID))
{
retVal = true;
}
if (this.producedAt != DateTime.MinValue)
{
retVal = true;
}
return retVal;
}