rudolf is the stepbrother of babbage for RDF datasets
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rudolf is an HTTP API that wraps a SPARQL endpoint to expose RDF-schema - compatible datasets, according to OpenSpending's babbage API specification. rudolf's name was chosen to remind the letters contained in the RDF acronym.


rudolf is based on Laravel 5.2. In order to install rudolf, you first have to setup a web server that supports the execution of PHP7 scripts. rudolf may also work with PHP >5.5.9, but it has not been yet tested with versions of PHP other than version 7.

The PHP extension php_mbstring is also required. You can install this by running sudo apt-get install php-mbstring in your debian-based operating system.

To support friendly URL's please make sure you have enabled mod_rewrite in your PHP installation.

After setting up your environment, you can install rudolf:

  1. Clone this repository:

    git clone

  2. Get into the newly created directory:

    cd rudolf

  3. Run composer to install dependencies:

    composer install --no-scripts


After installing rudolf, change the configuration file located at config/sparql.php and set the appropriate endpoint URI.

Command line operations

The structure of the datasets is dynamically discovered from the SPARQL endpoint the very first time a cube model is requested. The same goes for member values. They are then stored to the local cache.

Some operations may take long time in order to finish. There are some commands available to make life easier and avoid browser HTTP timeout:

  • model:clear {cubename}: Clears a cube model
  • model:load {cubename}: Loads a cube model
  • search:load: Loads the whole search endpoint model

To run a command, cd to rudolf's root folder and enter php artisan {command} {parameters}

For instance: php artisan model:load global loads the global cube

More commands are on the way! In the meantime, you can always use cache:clear.

Official API Documentation

Documentation for the API can be found in the official OpenSpending pages.


Current version:

  • v0.1: Initial version - partial support of the babbage API

Next versions

  • v0.2: Code cleanup, support hierarchical dimensions
  • v0.3: Support cosmopolitan API equivalents


If you are unable to acccess the API endpoint (e.g., rudolf/public/api/3/cubes path on your installation returns Not Found page), please check the following:

  1. Your website directory (e.g. \var\www\ is writable by www-data). Use ls -l to check the permission.

  2. You may need to change your apache configuration in /etc/apache2/sites-available/000-default.conf. Within <VirtualHost> tag, provide the following lines:

    <Directory /var/www/html>
    Options Indexes FollowSymLinks MultiViews
    AllowOverride All
    Order allow,deny
    allow from all
  3. Restart Apache.


The rudolf API is open-source software licensed under the MIT license. It is funded by by the Horizon 2020 project (Grant Agreement 645833).