RSS 1.0 Modules: Taxonomy

Abstract

The taxonomy module is a RSS 1.0 module and a RDF application enabling the identification of topics covered by a RSS channel or item.

Authors

The members of the RSS-DEV Working Group:

Version

Status

Proposed

Comments should be directed to the

Rights

Copyright © 2000, 2001 by the Authors.

Permission to use, copy, modify and distribute the RSS 1.0 Specification Proposal and its accompanying documentation for any purpose and without fee is hereby granted in perpetuity, provided that the above copyright notice and this paragraph appear in all copies. The copyright holders make no representation about the suitability of the specification for any purpose. It is provided "as is" without expressed or implied warranty.

This copyright applies to the RSS 1.0 Specification Proposal and accompanying documentation and does not extend to the RSS format itself.

Description

Affords the ability to classify channels and items under one or more taxonomic schemes.

Namespace Declaration

• xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"

Model

First level element:

• <taxo:topic> (taxo:link,taxo:topics, [*]), attribute: rdf:about.
  This element is optionally used to define a topic.
  [*] The meaning of a taxo:topic element is very similar to the meaning of a rss:channel element and all the elements (except for items, textinput and image) that are allowed in a rss:channel element can be used in taxo:topic unless stated otherwise.
  The list of elements has been kept minimum and our recommendation is to use the Dublin Core module to provide a finer description of a topic.

Second level element (may be included in channel, item or taxo:topic):

• <taxo:topics> (rdf:Bag)
  This element gives (using an rdf:Bag/rdf:li structure) a list of topics. These topics may or may not be defined within the scope of the current channel. The location of documents describing the topics may optionally be given using a generic include module to be defined.

Examples

<?xml version="1.0"?> 

<rdf:RDF 
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
  xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"
  xmlns="http://purl.org/rss/1.0/"
> 

  <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0">
    <title>Meerkat</title>
    <link>http://meerkat.oreillynet.com</link>
    <description>Meerkat: An Open Wire Service</description>
	...
  </channel>

  <item rdf:about="http://c.moreover.com/click/here.pl?r123" position="1">
    <title>XML: A Disruptive Technology</title> 
    <link>http://c.moreover.com/click/here.pl?r123</link>
    <description>
      XML is placing increasingly heavy loads on the existing technical
      infrastructure of the Internet.
    </description>
    <taxo:topics>
      <rdf:Bag>
        <rdf:li resource="http://meerkat.oreillynet.com/?c=cat23">
        <rdf:li resource="http://meerkat.oreillynet.com/?c=47">
        <rdf:li resource="http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/">
      </rdf:Bag>
    </taxo:topics>
  </item> 

  <taxo:topic rdf:about="http://meerkat.oreillynet.com/?c=cat23">
    <taxo:link>http://meerkat.oreillynet.com/?c=cat23</taxo:link>
  </taxo:topic>

  <taxo:topic rdf:about="http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/">
    <taxo:link>http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/</taxo:link>
    <taxo:topics>
      <rdf:Bag>
        <rdf:li resource="http://meerkat.oreillynet.com/?c=cat23">
        <rdf:li resource="http://dmoz.org/Computers/Data_Formats/Markup_Languages/SGML/">
        <rdf:li resource="http://dmoz.org/Computers/Programming/Internet/">
      </rdf:Bag>
    </taxo:topics>
  </taxo:topics>
</rdf:RDF>

Example using the Dublin Core module:

<?xml version="1.0"?> 

<rdf:RDF 
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
  xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"
  xmlns:dc="http://purl.org/dc/elements/1.1/"
  xmlns="http://purl.org/rss/1.0/"
> 

  <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0">
    <title>Meerkat</title>
    <link>http://meerkat.oreillynet.com</link>
    <description>Meerkat: An Open Wire Service</description>
	...
  </channel>

  <item rdf:about="http://c.moreover.com/click/here.pl?r123" position="1">
    <title>XML: A Disruptive Technology</title> 
    <link>http://c.moreover.com/click/here.pl?r123</link>
    <description>
      XML is placing increasingly heavy loads on the existing technical
      infrastructure of the Internet.
    </description>
    <taxo:topics>
      <rdf:Bag>
        <rdf:li resource="http://meerkat.oreillynet.com/?c=cat23">
        <rdf:li resource="http://meerkat.oreillynet.com/?c=47">
        <rdf:li resource="http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/">
      </rdf:Bag>
    </taxo:topics>
  </item> 

  <taxo:topic rdf:about="http://meerkat.oreillynet.com/?c=cat23">
    <taxo:link>http://meerkat.oreillynet.com/?c=cat23</taxo:link>
    <dc:title>Data: XML</taxo:title>
    <dc:description>A Meerkat channel</dc:description>
  </taxo:topic>

  <taxo:topic rdf:about="http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/">
    <taxo:link>http://dmoz.org/Computers/Data_Formats/Markup_Languages/XML/</taxo:link>
    <dc:title>XML</taxo:title>
    <dc:subject>XML</dc:subject>
    <dc:description>DMOZ category</dc:description>
    <taxo:topics>
      <rdf:Bag>
        <rdf:li resource="http://meerkat.oreillynet.com/?c=cat23">
        <rdf:li resource="http://dmoz.org/Computers/Data_Formats/Markup_Languages/SGML/">
        <rdf:li resource="http://dmoz.org/Computers/Programming/Internet/">
      </rdf:Bag>
    </taxo:topics>
  </taxo:topics>


</rdf:RDF>