March 2003
Intermediate to advanced
224 pages
6h 27m
English
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Chapter 11. Developing New Modules
Inventions reached their limit long ago, and I see no hope for further development.
—Sextus Julius Frontinus
In this chapter, we will create a new module and extend a desktop reader (AmphetaDesk) to understand it. We will also discuss the differences between the RSS 1.0 and RSS 2.0 data models and the effect of these differences on module design.
We have already dealt with the RDF data model in detail in Chapter 5, so we must now look at RSS 2.0.
Namespaces and Modules with RSS 2.0
RSS 2.0 introduces namespaced modules to the simple strand of RSS. The specification document states:
A RSS feed may contain elements not described on this page, only if those elements are defined in a namespace. The elements defined in this document are not themselves members of a namespace, so that RSS 2.0 can remain compatible with previous versions in the following sense — a version 0.91 or 0.92 file is also a valid 2.0 file. If the elements of RSS 2.0 were in a namespace, this constraint would break, a version 0.9x file would not be a valid 2.0 file.
Other than not defining a namespace for the core elements of RSS 2.0,
the modules work in the same way as the modules for RSS 1.0: declare
the module’s namespace in the root element (which in
the case of RSS 2.0 is, of course, rss) and then
use the module elements as directed by their specification. Parsers
that do not recognize the namespace just ignore the new elements.
Differences from RSS 1.0
Whether or not RSS 1.0 modules ...
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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.