/// <summary>
/// Creates an offer or result from the specified data-form.
/// </summary>
/// <param name="form">The data-form to include in the feature negotiation
/// offer or result.</param>
/// <returns>An XML element representing the feature negotiation
/// offer or result.</returns>
/// <exception cref="ArgumentNullException">The form parameter is
/// null.</exception>
public static XmlElement Create(DataForm form)
{
form.ThrowIfNull("form");
return Xml.Element("feature",
"http://jabber.org/protocol/feature-neg").Child(form.ToXmlElement());
}
