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Originated by UserLand Software in 1997, Netscape Communications subsequently announced RSS 0.9 (RDF Site Summary) in March 1999. Intended for populating their My Netscape portal with news channels, 0.9 is a simple XML format with 10 elements used to describe information about Web sites, typically news stories or articles, etc. These elements include the notion of a "channel," that contains up to 15 "item"s, each of which consist of a "title" and a "link." Webmasters could use RSS 0.9 files to syndicate their content, using links (no descriptions) to their stories. The format is still quite popular, with about 45% of RSS files surveyed in May, 2001.
From the RSS 0.9 DTD:
"RSS is an XML/RDF vocabulary for describing metadata about websites, and enabling the display of 'channels' on the 'My Netscape' website."
<!ELEMENT rdf:RDF (channel | image? | item+ | textinput?)*>
<!ATTLIST rdf:RDF
xmlns:rdf CDATA #FIXED "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns CDATA #REQUIRED> <!-- must be "http://my.netscape.com/rdf/simple/0.9/"> -->
<!ELEMENT channel (title | description | link)*>
<!ELEMENT title (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT link (#PCDATA)>
<!ELEMENT image (title | url | link)*>
<!ELEMENT url (#PCDATA)>
<!ELEMENT item (title | link)*>
<!ELEMENT textinput (title | description | name | link)*>
<!ELEMENT name (#PCDATA)>Here's a snippet of an actual RSS 0.9 file from WebReference.com:
<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>WebReference News</title>
<link>http://www.webreference.com</link>
<description>Daily news, views, and how-tos on all aspects of web design
and development. Features free web-based tools, open source scripts, and
in-depth tutorials on DHTML, HTML, JavaScript, 3D, Graphics, XML, and Design
for webmasters.</description>
</channel>
<image>
<title>WebReference.com</title>
<url>http://webreference.com/art/wr.gif</url>
<link>http://www.WebReference.com</link>
</image>
<item>
<title>The Evolution of RSS</title>
<link>http://www.webreference.com/authoring/languages/xml/rss/1/</link>
</item>
<item>
<title>Weblog 2.0 Released</title>
<link>http://www.webreference.com/perl/tutorial/22/</link>
</item>
...
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Created: May 03, 2001
Revised: April 14, 2003
