Newsfeeds und Content Syndication mit RSS (aus Wiki)
What is RSS?
By Mark Pilgrim (http://www.xml.com/lpt/a/2002/12/18/dive-into-xml.html)
RSS is a format for syndicating news and the content of news-like sites, including major news sites like Wired, news-oriented community sites like Slashdot, and personal weblogs. But it’s not just for news. Pretty much anything that can be broken down into discrete items can be syndicated via RSS: the “recent changes” page of a wiki, a changelog of CVS checkins, even the revision history of a book. Once information about each item is in RSS format, an RSS-aware program can check the feed for changes and react to the changes in an appropriate way.
Verzeichnisse von RSS-Newsfeeds
- A directory of 10,000 publicly available RSS feeds: http://www.syndic8.com/
RSS 2.0 Format
- Datumsfelder müssen nach RFC822 (1982) aufgebaut sein; d.h. es muss zwingend immer der Wochentag am Anfang stehen.
- Der Verfasser eines Artikels kann nur als E-Mail-Adresse angegeben werden, nicht als Klartext.
- Validator: http://feedvalidator.org
- RSS Clients: Newsfeed Reader
- RSS Bandit
- RSS Server: Newsfeed Writer
A brief RSS history
Code Fragments only
But coders beware. The name “RSS” is an umbrella term for a format that spans several different versions of at least two different (but parallel) formats. The original RSS, version 0.90, was designed by Netscape as a format for building portals of headlines to mainstream news sites. It was deemed overly complex for its goals; a simpler version, 0.91, was proposed and subsequently dropped when Netscape lost interest in the portal-making business. But 0.91 was picked up by another vendor, UserLand Software, which intended to use it as the basis of its weblogging products and other web-based writing software.
In the meantime, a third, non-commercial group split off and designed a new format based on what they perceived as the original guiding principles of RSS 0.90 (before it got simplified into 0.91). This format, which is based on RDF, is called RSS 1.0. But UserLand was not involved in designing this new format, and, as an advocate of simplifying 0.90, it was not happy when RSS 1.0 was announced. Instead of accepting RSS 1.0, UserLand continued to evolve the 0.9x branch, through versions 0.92, 0.93, 0.94, and finally 2.0.
What a mess.
Abbildung 1: SVG-Grafik showing this family tree (GitHub: Rss-Family.svg)
So which one do I use?
That’s 7 — count ’em, 7! — different formats, all called “RSS”. As a coder of RSS-aware programs, you’ll need to be liberal enough to handle all the variations. But as a content producer who wants to make your content available via syndication, which format should you choose?
RSS versions and recommendations
Tabelle 1: RSS versions
|0.90||Netscape||Obsoleted by 1.0||Don’t use|
|0.91||UserLand||Drop dead simple||Officially obsoleted by 2.0, but still quite popular||Use for basic syndication. Easy migration path to 2.0 if you need more flexibility|
|0.92, 0.93, 0.94||UserLand||Allows richer metadata than 0.91||Obsoleted by 2.0||Use 2.0 instead|
|1.0||RSS-DEV Working Group||RDF-based, extensibility via modules, not controlled by a single vendor||Stable core, active module development||Use for RDF-based applications or if you need advanced RDF-specific modules|
|2.0||UserLand||Extensibility via modules, easy migration path from 0.9x branch||Stable core, active module development||Use for general-purpose, metadata-rich syndication|
Da RSS-Dateien ein XML-Dialekt darstellen, sollte immer ein korrekter Namespace angegeben werden….
Eigene RSS Newsdfeeds
Siehe: Newsfeed Reader
— Main.DietrichKracht – 07 Feb 2004