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Including Item Provenance In the document-oriented view, all the feed metadata of title and description and so on is present in the document. If an item is used outside of the original XML document in which it appeared then the feed metadata may be lost. In some circumstances this won t matter much, but then information such as the author of the items and copyright details may only be given at feed level. When items are extracted from a feed, such information can be attached directly to each individual item. Syndication technologies are still in their infancy, and the jury is still out on the best approach to take to this. Here is an example of an item in one of the feeds from xml.com, published in RSS 0.91:
http://www.xml.com/pub/a/2004/06/09/deviant.html The Semantic Web appears to be powering ahead: so why are there so many doubters in the XML world? The same item was aggregated and republished in a PubSub feed, which is RSS 2.0:
http://www.xml.com/pub/a/2004/06/09/deviant.html Mon, 05 Jul 2004 05:48:38 -0500 http://www.xml.com/ XML.com
Source: XML-Deviant: Something Useful This Way Comes
Link: http://www.xml.com/pub/a/2004/06/09/deviant.html

The Semantic Web appears to be powering ahead: so why are there so many doubters in the XML world?]]> Some escaping of the content has taken place, presumably to help ensure well-formedness, but the interesting part is how PubSub provides item provenance information. The element is used to point back to the host Web site from which the item came, here an aggregator is likely to display this as a link. The
element has been carried over exactly as it appeared in the original feed. Although it makes full use of the item-oriented syndication model, PubSub also takes advantage of the document- oriented view and provides its feeds in an HTML browser-readable style (using XSL). The republished item appears in a browser, as shown in Figure 20-7. 250 Chapter 20
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