March 2003
Intermediate to advanced
224 pages
6h 27m
English
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Name
mod_changedpage
Synopsis
mod_changedpage
does for
RSS 1.0 what the cloud element does for RSS 0.9x
— it introduces a form of Publish and Subscribe.
We’ll discuss
Publish and Subscribe in
detail in Chapter 12, but basically it enables a
system in which you can “subscribe”
to a feed and be notified when something new is published.
mod_changedpage uses only one element, which
points to a changedPage server. Users wishing to
be told when the feed has updated send an HTTP POST request of a
certain format to this server. Upon updating, this server sends a
similar POST request back to the user. The user’s
client then knows about the update. Again, Chapter 12 examines this in detail.
Namespace
mod_changedpage takes the namespace prefix
cp: and is identified by the URI
http://my.theinfo.org/changed/1.0/rss/. Hence, its
declaration looks like this:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
xmlns:cp="http://my.theinfo.org/changed/1.0/rss/">Element
mod_changedpage takes only one element, a
subelement of channel
:
-
<cp:serverrdf:resource="URL"/> The URL is the address of the changedPage server.
Example
Example 7-6. mod_changedpage in the channel
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns=http://purl.org/rss/1.0/
xmlns:cp="http://my.theinfo.org/changed/1.0/rss/" > <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0"> <title>Meerkat</title> <link>http://meerkat.oreillynet.com</link> ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.