March 2003
Intermediate to advanced
224 pages
6h 27m
English
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Chapter 5. Richer Metadata and RDF
Every public action which is not customary, either is wrong, or, if it is right, is a dangerous precedent. It follows that nothing should ever be done for the first time.
—Francis M. Cornford
The feeds we’ve seen so far are very simple. They provide little information beyond what is needed for the instant gratification of displaying the feed in a human-readable form. Of course, this isn’t such a bad deal — many people only want to display the feeds as they come.
Others, however, are more ambitious in their plans for the RSS feeds they use, and for this they require a far richer set of metadata. In this chapter, we look at metadata and give a basic overview of the Resource Descriptive Framework (RDF). This will prepare us for Chapter 6 and the pleasures of RSS 1.0 — the RDF-based RSS standard.
Metadata in RSS 0.9x
As all good tutorials on the subject will
tell you, metadata is data about data. In the case of RSS 0.92,
this includes the name of the author of the feed, the date the
channel was last updated, and so on. In Example 5-1, the bold code is the metadata. You could
remove this data, and the feed itself would still both parse and be
useful to the reader when displayed as HTML. The metadata is in the
background, silent, but meaningful to those who can see it.
Example 5-1. The metadata within an RSS 0.92 feed
<rss version="0.92"> <channel> <title>RSS0.92 Example</title> <link>http://www.oreilly.com/example/index.html</link> <description>This is ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.