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. Resource discovery: RDF can improve the relevance of resources returned by search engines. . Cataloging: RDF can allow relationships between parts of the content of a Web site or other source of information to be represented more meaningfully. . Intelligent agents: RDF can be used to facilitate the exchange of information between information systems. . Intellectual property: RDF can be used to express intellectual property rights for documents or collections of documents. One widely used piece of software that uses RDF under the covers is the Mozilla browser and its associated Firefox and Thunderbird companion products. RDF and RSS 1.0 Having briefly introduced some foundational parts of RDF, it s time to look in a little more detail at the use of RDF elements in RSS 1.0. The document element of each RSS 1.0 document is an RDF element, the rdf:RDF element. Each of the child elements of the RSS 1.0 rdf:RDF element, that is the channel, item, image, and textinput elements, must have an rdf:about attribute. The values in such rdf:about attributes are used to associate two elements in different parts of the RSS 1.0 document. For example, each item listed inside the items element has an rdf:resource attribute: The URI specified in each rdf:resource attribute must match the URI specified in an item element elsewhere in the RSS 1.0 document: Typically, the URI specified in these two attributes is a URL that specifies the location from which the resource associated with the URI can be retrieved. Formally, it is the link element, which is a child of the item element that contains the URL that allows the item to be retrieved. Often, however, the URI associating the rdf:li and item elements is character for character identical to the URL which is the content of the link element. The rdf:Seq element is used inside the items element since a sequence of items is being specified. Typically, the order of items inside the rdf:Seq element will be used by an aggregator to determine display order for the information feed items. In RSS 1.0 the rdf:Seq element is used in preference to the rdf:Bag, because the content of rdf:Seq is ordered, unlike the content of rdf:Bag. 116 Chapter 11

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