Extension:Semantic OLAP
 | This extension is currently not actively maintained! Although it may still work, any bug reports or feature requests will more than likely be ignored. |
 Release status: unmaintainedCategory:Unmaintained extensions |
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| Implementation | AjaxCategory:Ajax extensions, Special pageCategory:Special page extensions, Data extractionCategory:Data extraction extensions |
| Description | Analyse data in Semantic MediaWiki by using OLAP functionality |
| Author(s) | Tobias Wellertalk |
| Latest version | 1.0 (2017-06-12) |
| MediaWiki | 1.19+Category:Extensions with manual MediaWiki version |
| PHP | 5.3+ |
| Database changes | No |
| License | MIT License |
| Download | GitHub: Note: |
Semantic OLAP is an extension to Semantic MediaWiki that allows to query and analyse data, stored in the semantic MediaWiki, by using OLAP functionality. Users can analyse the data from different views by changing the pivot table. Semantic OLAP uses orbjs, which is based on React.js, to customize and control the pivot table.
Installation
- Download, extract and place the file(s) in a directory called
SemanticOLAPin yourextensions/folder. - Add the following code at the bottom of your LocalSettings.php file:
wfLoadExtension( 'SemanticOLAP' );
Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.
Usage
Select Data
In the initial screen of the Semantic OLAP Special Page, the data that should be queried must be selected.
- At least one Category and one Property must be selected.
- Autocomplete simplifies the input and suggests available Categories and Properties
On the basis of the input, a simple ASK Query is created in the background. If no result is returned, a Popup appears with the corresponding ASK query.
Analyse Data
Tool allows to analyse the data by using OLAP functionality.
- Use Drag&Drop to change the view on the pivot table
- If multiple values are linked to the same Property then only the first Value is selected.
- If a property is of type "Quantity", the corresponding unit is displayed.
- Click on "Select Data" to get back to the initial screen and select the data for analysis
Filter and Sort Values
Semantic OLAP allows to filter for values. In order to filter, click on the right icon on the corresponding property and filter vor values either by
- Matches (i.e. greater than, lower than)
- Tick the concrete values
Export Data
The current view on the data is downloaded in spreadsheet format by clicking on the export xls button.
Future Work
- Select aggregation function (sum, avg, max, min)
- Currently, only sum is available
- Advanced ASK Queries/Selection of data
- Using advanced queries in SMW 2.5
- Compound Queries
- Allow to display information in graphs
Ideas
- Include the Semantic OLAP into a page
See also
- Link to authors
- Link to information pages
- Semantic OLAP: Information about Semantic OLAP on AIFB page
- AIFB (KIT): Institute of Applied Informatics and Formal Description Methods
- Presentation on SMWCon Fall 2016