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Newsfeed formats
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<textInput> Another rarely used element, <textInput> offers a way for a
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publisher to allow a reader to query the publisher s web site.
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<skipDays> and <skipHours> These elements allow publishers to specify
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the times during which a newsfeed is unlikely to be updated. Most newsfeed readers ignore these values. Let s get back to our history lesson, picking up the story with RSS 1.0.
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The XML elements that make up RSS 0.91
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The RDF fork: RSS 1.0
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4.2 The RDF fork: RSS 1.0
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RSS 0.91 was clearly useful, but just about everybody agreed that it needed some improvement and additional metadata. Unfortunately, the RSS user and developer community was divided about how RSS should be improved. A group of RDF advocates wanted to bring the full power of RDF back into RSS. Dave Winer, on the other hand, wanted to keep RSS as simple as possible. The two sides did not get along well and eventually, in December 2000, the RDF advocates released what they called RSS 1.0 a new version of RSS with RDF back in the mix and with
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support for extension modules. RSS 1.0 was well received. It was adopted by the popular Movable Type blogging system and as a result is still in widespread use. Let s take a close look at it, starting with the sample RSS 1.0 newsfeed shown in listing 4.2. This feed is taken from the specification itself. Some optional elements have been removed for the sake of brevity.
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Listing 4.2 Example of an RSS 1.0 format newsfeed
< xml version="1.0" > <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/"> <channel rdf:about="http://www.xml.com/xml/news.rss"> <title>XML.com</title> <link>http://xml.com/pub</link> <description> XML.com features a rich mix of information and services for the XML community. </description> <items> <rdf:Seq> <rdf:li resource="http://xml.com/pub/2000/08/09/xslt/xslt.html"/> <rdf:li resource="http://xml.com/pub/2000/08/09/rdfdb/index.html"/> </rdf:Seq> </items> </channel> <item rdf:about="http://xml.com/pub/2000/08/09/xslt/xslt.html"> <title>Processing Inclusions with XSLT</title> <link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link> <description> Processing document inclusions with general XML tools can be problematic. This article proposes a way of preserving inclusion information through SAX-based processing. </description> </item> <item rdf:about="http://xml.com/pub/2000/08/09/rdfdb/index.html">
Newsfeed formats
<title>Putting RDF to Work</title> <link>http://xml.com/pub/2000/08/09/rdfdb/index.html</link> <description> Tool and API support for the Resource Description Framework is slowly coming of age. Edd Dumbill takes a look at RDFDB, one of the most exciting new RDF toolkits. </description> </item> </rdf:RDF>
The first thing to note is that the newsfeed is an RDF document b. Next, notice that the containment hierarchy is different from that of earlier forms of RSS. The <item> elements are not contained within the <channel> element c. The channel is essentially the header for the file. It contains the <title> d, <link> e, and <description> f of the newsfeed, as well as an RDF-style table of contents g that lists the items in the newsfeed. Each <item> contains the same <title>, <link>, and <description> elements as in previous versions of RSS, except that the item permalink is specified twice once in the rdf:about attribute h and once in the <link> element i. Note that an item-level <date> element is still not part of the format, but it is common practice for RSS 1.0 newsfeeds to include the Dublin Core extension module and a <dc:date> element in each item. We ll show you how to do that in section 4.2.2.
4.2.1 The elements of RSS 1.0
As we did with RSS 0.91, let s take a look at a summary diagram of RSS 1.0. Figure 4.2 shows the XML elements that make up RSS 1.0, the containment hierarchy, and the optional and required elements. We use the same notation we used in figure 4.1, along with a new notation: required XML attributes are marked with an at sign (@). By comparing the RSS 0.91 and RSS 1.0 diagrams, you can see that the formats are significantly different. Here are the key differences:
A typical RSS 1.0 newsfeed is longer and more complex, but it does not include as much metadata as the equivalent RSS 0.91 newsfeed.
RSS 1.0 is more complex, but only because it is more flexible and extensible.
The root element is <RDF:rdf> rather than <rss>. News items exist as children of the document s root element and not as children of the <channel> element, as they do in RSS 0.91. News items must be declared inside the <channel> as RDF resources.
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