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The second type of node element that we ll look at is the <rss:item> element. Each RSS page should contain one or more such <rss:item> elements, each of which describes one of the items that are being summarized within the RSS page. The <rss:item> element has an rdf:about attribute that references the URL summarized by the item. This URL is the same as the URL used in the rdf:resource attribute of one of the <rdf:li> elements within the <rss:items> element in the channel description outlined previously. The <rss:item> element contains three property elements: <rss:title> A literal property giving a title for the item <rss:link> A literal property giving the URL for the item (this will usually be the same as the URL in the <rss:item> element s rdf:about attribute) <rss:description> An optional literal property giving a more detailed description of the item (as opposed to the <rss:title>, which gives only the headline )
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Example RSS Page
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As examples of RSS, we ll look at two RSS documents that could provide useful material for our TV guide. The first is a site that provides reviews of the TV programs showing over the next 24 hours. The RSS page reviews.rss, shown in Listing 17-1, gives a summary of each review, with URLs referencing back to the main site so that you can get more details. One thing to note here is that the URLs provided by the site use the VIDEO Plus+ code for each program to identify them uniquely. Listing 17-1. reviews.rss <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rss="http://purl.org/rss/1.0/"> <rss:channel rdf:about="http://www.example.com/reviews/reviews.rss"> <rss:title>TV Reviews</rss:title> <rss:link>http://www.example.com/reviews/</rss:link> <rss:description> Reviews of TV programs showing in the next 24 hours. </rss:description> ... <rss:items> <rdf:Seq> <rdf:li rdf:resource="http://www.example.com/reviews/2571.html" />
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CHAPTER 17 INTERPRETING RSS WITH XSLT
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<rdf:li rdf:resource="http://www.example.com/reviews/85674.html" /> ... </rdf:Seq> </rss:items> </rss:channel> <rss:item rdf:about="http://www.example.com/reviews/2571.html"> <rss:title>EastEnders: They're Mad About the Boy</rss:title> <rss:link>http://www.example.com/reviews/2571.html</rss:link> <rss:description> Jamie Mitchell has never been so popular. </rss:description> ... </rss:item> <rss:item rdf:about="http://www.example.com/reviews/85674.html"> <rss:title>Panorama: Current Issues</rss:title> <rss:link>http://www.example.com/reviews/85674.html</rss:link> <rss:description> Today's Panorama tackles the issue of pet cloning. </rss:description> ... </rss:item> ... </rdf:RDF>
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Note VIDEO Plus+ numbers are the UK equivalent of VCR Plus+ numbers in the US.
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The second example page is listing.rss, given in Listing 17-2, which provides a program listing. Note that new programs are added at the top of the list, so that the most recent item is a program that s just been added to the listing. Also note that the program identifiers use the timing of the program, while the links from the <rss:item> elements point to pages that may contain details about lots of programs. Listing 17-2. listing.rss <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rss="http://purl.org/rss/1.0/"> <rss:channel rdf:about="http://www.example.com/bbc1/listing.rss"> <rss:title>BBC1</rss:title> <rss:link>http://www.example.com/bbc1/</rss:link> <rss:description> Listings of BBC 1 programs over the next 24 hours </rss:description> ... <rss:items> <rdf:Seq>
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CHAPTER 17 INTERPRETING RSS WITH XSLT
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<rdf:li rdf:resource="http://www.example.com/bbc1#2001-07-05T21:30:00" /> <rdf:li rdf:resource="http://www.example.com/bbc1#2001-07-05T20:45:00" /> ... </rdf:Seq> </rss:items> </rss:channel> <rss:item rdf:about="http://www.example.com/bbc1#2001-07-05T21:30:00"> <rss:title>Panorama</rss:title> <rss:link>http://www.bbc.co.uk/panorama</rss:link> <rss:description> Today discusses whether cloning pets is morally wrong. </rss:description> ... </rss:item> <rss:item rdf:about="http://www.example.com/bbc1#2001-07-05T20:45:00"> <rss:title>The National Lottery</rss:title> <rss:link>http://www.bbc.co.uk/lottery/</rss:link> <rss:description> Stunning celebrity guests and a grand giveaway. </rss:description> ... </rss:item> ... </rdf:RDF>
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RSS Modules
As we saw in the previous section, the required content in an RSS page is rather brief and doesn t give a lot of detail about either the channel or the items that it describes. However, this is part of the design of RSS different types of channels require different kinds of supplementary information for their items, so RSS defines a number of modules that can be used to add extra information to the basic RSS pages. These extra modules define additional property elements that can be used within <rss:channel> or <rss:item> elements. The two modules that we ll look at briefly here are the Dublin Core module, which provides standard metadata properties (particularly relevant for web documents), and the Syndication module, which provides properties to do with how often an RSS feed is updated. We ll also see how it s possible for RSS applications to use their own properties if they wish.
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