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RSS and Syndication
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IN THIS CHAPTER, we describe how portlets can aggregate links to content on external web sites using the group of standards known as RSS. We also discuss how the content of your own portal could be syndicated for convenient inclusion in external sites using the same mechanism.
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Overview of RSS
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RSS is not a single standard. It is several standards, some closely related, and others more loosely so. The versions of RSS that are most commonly used are 0.9 and 0.91, both of which were released by Netscape to allow content from external web sites to be aggregated into its My Netscape portal. Since 0.91, two groups have produced new versions of RSS with varying degrees of backward compatibility. The company UserLand Software carried out early development of RSS for Netscape and has subsequently released versions 0.92, 0.93, 0.94, and 2.0. The RSS-DEV working group (an independent group of developers) released the 1.0 version of RSS stemming from the 0.91 version.
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NOTE Some but not all of these versions are based on the Resource Description Framework (RDF) format. This rather more consistently managed standard from the World Wide Web Consortium (W3C) standards body provided a standard for presenting metadata. A syndication feed is a set of metadata; it does not (generally) provide the articles itself, but will provide their titles, some associated links, and abstracts of the articles.
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RDF in this respect is ideal however, it is quite a complex standard; RSS pragmatically provides a reasonable subset of this information oriented specifically toward syndication at the cost of a somewhat fragmented standard.
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Even the naming of the standard reflects the version confusion. Correctly or otherwise, you may see any of these versions referred to as one of Really Simple Syndication, Rich Site Summary, or RDF Site Summary. In practice, it is simplest to refer to RSS by its acronym alone, and use a version number if you feel the need to be specific.
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The good news is that amid this riot of colorful standards for RSS, the RSS Portlet that we use to acquire and present syndicated content is quite agnostic. You can import an RSS feed in formats 0.90 through to 2.0. The only thing that you cannot import is invalid XML. RSS is not the only game in town there are various other standards for making this type of meta-information available and for syndicating content. Although we won t be covering them any further, you should be familiar with RDF (which we ve already mentioned) and the up-and-coming Atom standard (in development at www.atomenabled.org), which aims to be a more standard standard!
Walking Through an Example RSS File
Let s now take a look at some concrete examples of RSS feeds in the most commonly encountered 0.9 and 0.91 formats. Both formats provide a number of optional elements, but for the most part we will ignore these in favor of those most commonly encountered in the wild.
Version 0.9
The following is a correct RSS 0.9 feed describing the authors web site, including the compulsory elements and some of the optional ones:
< xml version="1.0" > <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://my.netscape.com/rdf/simple/0.9/"> <channel> <title>PortalBook Technical Notes</title> <link>http://portalbook.com/</link> <description> Discourse and exposition on Java and developing Portlets </description> </channel> <item> <title>New version of Jetspeed released</title> <link> http://portalbook.com/notes/005.html </link> </item>
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<item> <title>Collections and iterations</title> <link> http://portalbook.com/notes/004.html </link> </item> <item> <title>Deprecated techniques</title> <link> http://portalbook.com/notes/003.html </link> </item> </rdf:RDF>
The format is so simple it barely needs explanation, which is indubitably one of the reasons for the enthusiastic early take-up. The first version of RSS was a valid RDF document. As such it fell within the RDF namespace defined by the W3C. The simple elements required by Netscape s format are specified in the default namespace:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://my.netscape.com/rdf/simple/0.9/">
The <channel> element contains the metadata for the feed its title, the site from which it can be obtained, and a human-readable description of its content. One of the deficiencies of the 0.9 format over later submissions is that it is restricted to a single channel, so a web site proffering diverse subject matter must provide multiple distinct feeds rather than a single RSS feed with multiple channels:
<channel> <title>PortalBook Technical Notes</title> <link>http://portalbook.com/</link> <description> Discourse and exposition on Java and developing Portlets </description> </channel>
The <item> element repeats multiple times, once for each article or item of interest that is being publicized in the feed. There is a hard limit of 15 items permissible in the channel. The items includes a title describing the data to be
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