/// <summary>
/// Reads an atom:id element in a source element.
/// </summary>
/// <param name="atomFeedMetadata">The feed metadata to augment.</param>
/// <remarks>
/// Pre-Condition: XmlNodeType.Element (atom:icon) - the atom:icon element to read.
/// Post-Condition: Any - the node after the atom:icon element which was read.
/// </remarks>
private void ReadIdElementAsSourceId(AtomFeedMetadata atomFeedMetadata)
{
this.AssertXmlCondition(XmlNodeType.Element);
Debug.Assert(
this.XmlReader.LocalName == AtomConstants.AtomIdElementName && this.XmlReader.NamespaceURI == AtomConstants.AtomNamespace,
"Only atom:id elements can be read by this method.");
this.VerifyNotPreviouslyDefined(atomFeedMetadata.SourceId);
string elementValue = this.XmlReader.ReadElementValue();
atomFeedMetadata.SourceId = UriUtils.CreateUriAsEntryOrFeedId(elementValue, UriKind.Absolute);
}