Extension:RDFa

=What does this extension do?= This extension provides the functionality of outputing semantic data of Mediawiki pages in the RDFa format. The RDFa formatted data generated from a page will have the page itself as the subject. The properties and objects are retrived from the semantic data of this page.

Besides the user defined properties, this extension is also able to regconize the following special properties:
 * Category
 * Has Type
 * Modification date
 * "Sub-Category" relation
 * Subproperty of

The corresponding properties in the RDFa format are as follows:


 * typeof
 * Property:Has_type
 * Property:Modification date
 * http://www.w3.org/2000/01/rdf-schema#subClassOf
 * http://www.w3.org/2000/01/rdf-schema#subPropertyOf

This extension does not generate any visible content for usual reading. You should use an RDFa-aware browser or tool to use the RDFa metadata.

=Download and installation=

You can download the code at:


 * RDFa Extension

After you downloaded the code, place the 'RDFa' directory within your MediaWiki 'extensions' directory. Then, add the following code to your LocalSetting.php after the line that installs Semantic MediaWiki.

require_once ("$IP/extensions/RDFa/rdfa.php");

You can browse the code at:


 * Browse RDFa Extension

=Dependencies=

This extension requires Semantic MediaWiki.

=Examples=

capital of::Germany locate in::Europe has LatLong::52.5166667,13.4

Suppose there is a wiki page contains above structured data in wiki format. Further, lets assume the host address of the wiki is http://localhost/mediawiki. Then this extension will generate triples in the RDFa format as follows：

    

Notice that the extension use different html markup,  and &lt;div&gt;, to present the data. This is because the extension is able to regconize the type of the values of properties: the extension uses  to markup data if the value of property is another wiki page. Otherwise, the extension uses &lt;div&gt; markup. Also, the "typeof" property in the RDFa data is generated by the "Category" markup of wiki page.

These RDFa formatted data can be displayed as RDF triples:   .

  .

 <http://localhost/mediawiki/index.php/Property:Has_LatLong> "52.5166667,13.4".

<http://localhost/mediawiki/index.php/Berlin> <http://localhost/mediawiki/index.php/Property:Locate_in> <http://localhost/mediawiki/index.php/Europe>

<http://localhost/mediawiki/index.php/Berlin> <http://localhost/mediawiki/index.php/Property:Modification_date> "3 September 2009 02:19:03".

=Bugs, new feature request and contact information=

Please reports bug, feature requests, or any feedback to zhengj3-at-rpi.edu

=RDFa viewers=

Please look at http://rdfa.info/wiki/Tools

=Todo=


 * an "action=rdfa" option to a page to render only rdfa data

=Release Log=


 * Date: 2009-09-11, version number:0.0.1, Version Description: initial version, download link:RDFa