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Getting started

A working Sparql endpoint is needed to use the rdf entity module. You could either use a remote Sparql endpoint, or you could set one up locally.

Virtuoso is one of the more robust triple store solutions available, but any solution would do.

@todo Create an example module that uses http://dbpedia.org/sparql

Setting up Virtuoso

On a Debian based system

apt-cache search "^virtuoso" will show you available packages.

$ apt-get install virtuoso-opensource
$ service virtuoso-opensource-6.1 start

(Set the password during installation)

On Mac OS X system

  • Install Homebrew (see http://brew.sh)
  • $ brew install virtuoso
  • Start Virtuoso
    # The version might be differnet than 7.2.4.2.
    $ cd /usr/local/Cellar/virtuoso/7.2.4.2/var/lib/virtuoso/db
    $ virtuoso-t -f &
    
  • Administer at http://localhost:8890/conductor/. Login with dba/dba.

On an Arch Linux based system

Go to http://localhost:8890/conductor/ and login in with: dba - yourpass

Grant 'update' rights to the SPARQL user: System admin -> Users -> SPARQL (edit) Account roles -> Put SPARQL_UPDATE in 'Selected'

Connecting Drupal to the Sparql endpoint

The following example demonstrates the use with a local Virtuoso installation. To connect Drupal to the endpoint, the db connection should be added to the settings.php file.

$databases['sparql_default']['sparql'] = [
  'prefix' => '',
  'host' => '127.0.0.1',
  'port' => '8890',
  'namespace' => 'Drupal\\rdf_entity\\Database\\Driver\\sparql',
  'driver' => 'sparql',
  // Optional. This is actually the endpoint path. If omitted, 'sparql' will
  // be used.
  'database' => 'data/endpoint',
  // If the connection to the endpoint should be HTTPS secured. If omitted,
  // FALSE is assumed.
  'https' => FALSE,
];

Content translation

Rdf entities support basic content translations. This is still WIP.

Note: If content translations are enabled, the 'langcode' property must be mapped, otherwise entity reference fields will not store information.

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