/// <summary>
/// Populates this <see cref="DefibrillatorEpisode"/> instance from the data in the specified XML.
/// </summary>
///
/// <param name="typeSpecificXml">
/// The XML to get the DefibrillatorEpisode data from.
/// </param>
///
/// <exception cref="ArgumentNullException">
/// If <paramref name="typeSpecificXml"/> parameter is <b>null</b>.
/// </exception>
///
/// <exception cref="InvalidOperationException">
/// If the first node in <paramref name="typeSpecificXml"/> is not
/// a DefibrillatorEpisode node.
/// </exception>
///
protected override void ParseXml(IXPathNavigable typeSpecificXml)
{
XPathNavigator itemNav =
typeSpecificXml.CreateNavigator().SelectSingleNode(
"defibrillator-episode");
Validator.ThrowInvalidIfNull(itemNav, Resources.DefibrillatorEpisodeFieldUnexpectedNode);
_when = new HealthServiceDateTime();
_when.ParseXml(itemNav.SelectSingleNode("when"));
_episodeTypeGroup = XPathHelper.GetOptNavValue <CodableValue>(itemNav, "episode-type-group");
_episodeType = XPathHelper.GetOptNavValue <CodableValue>(itemNav, "episode-type");
_dataSource = XPathHelper.GetOptNavValue <CodableValue>(itemNav, "data-source");
_durationInSeconds = XPathHelper.GetOptNavValueAsUInt(itemNav, "duration-in-seconds");
_episodeFields = XPathHelper.ParseXmlCollection <DefibrillatorEpisodeField>(itemNav, "episode-fields/episode-field");
}
