Extension:FolkTagCloud

Description
This extension was created as part of a bachelor thesis as a means to allow distinction as well as combination of hierarchical categories and flat tags in the MediaWiki category system. It uses Semantic MediaWiki methods to implement a simple tagging functionality via a semantic property and to retrieve stored tags and display them in a tag cloud.

The extension can be used to add a social tagging feature to a Semantic MediaWiki, thus providing an additional option for knowledge structuring and information retrieval and enabling a disambiguation of category functions. Users can add label strings (so called FolkTags) to a wiki page and display the resulting folksonomy in various tag clouds. A cloud can be filtered by one or more given MediaWiki categories, thus combining the hierarchical category system with flat tags.

Usage
FolkTagCloud adds a predefined semantic attribute  to the wiki that can be used to tag pages using the SMW syntax:

The tags are values of the semantic attribute and are of type string. With the parser tag

the distribution of tags over the wiki can be displayed in a tag cloud, which can be adjusted via various parameters that are passed as XML style arguments to the parser tag.

Parser Tag Parameters

 * maxtags: (int) Maximum number of tags to be displayed (default=1000).


 * mincount: (int) Minimum frequency of a tag to be displayed in the tag cloud (default=1).


 * order: (frequency | alphabetical) Sorting criterion (default=false).


 * count: (boolean)  displays the frequency of a tag in parentheses (default=false).


 * increase: (log | linear) Linear or logarithmic increase of font size (default=linear).


 * increasefactor: (int) Font size increase factor(default=100).


 * minfontsize: (int) Minimum font size (default=77).


 * property: (SMW attribute) Attribute to be used instead of the predefined tagging attribute.

Parameters are passed like this:

Between der parser tags, one or more categories (separated by comma) can be passed:

This results in the filtering of the tag cloud by the given categories (and optionally their subcategories): only tags retrieved from wiki pages in the given categories are displayed.


 * subcategorylevel: (int) Level of subcategories included in the filtering (default=0).

Download instructions
Please cut and paste the code found below and place it in. Note: $IP stands for the root directory of your MediaWiki installation, the same directory that holds LocalSettings.php.

Installation
To install this extension, add the following to LocalSettings.php: The extension requires the Semantic MediaWiki extension and will not work without it.

$wgFTCTagName
The default semantic property that is used for tagging is a predefined property named. If a user defined property (e.g.