Retrieves the guid from the feed item.
[ itemGuid = ] FeedItem.Guid
itemGuid String that receives the guid element of the feed item.
The property is read-only. The property has no default value.
Guid is an optional feed item element. The property value is null if not specified in the source.
The GUID string uniquely identifies the feed item; however, the syntax of the string is left up to the author of the feed. If the guid element has an attribute named "isPermaLink" with a value of true, the string is assumed to be a valid URL to the item. The Windows RSS Platform copies the permalink value to the Link property of the FeedItem object when the feed is normalized, if Link is not otherwise defined.