/// <summary>
/// Create a BuildItemDefinitionGroupXml element and add it to the end of our ordered list.
/// </summary>
/// <exception cref="InvalidProjectFileException">If element does not represent a valid ItemDefinitionGroup element</exception>
internal void Add(XmlElement element)
{
BuildItemDefinitionGroupXml itemDefinitionGroupXml = new BuildItemDefinitionGroupXml(element, parentProject);
itemDefinitions.Add(itemDefinitionGroupXml);
evaluated = false;
}
