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Gregory Todd Williams


RDF::Endpoint - A SPARQL Protocol Endpoint implementation


This document describes RDF::Endpoint version 0.07.


 plackup /usr/local/bin/endpoint.psgi


This modules implements the SPARQL Protocol for RDF using the PSGI interface provided by Plack. It may be run with any Plack handler. See Plack::Handler for more details.

When this module is used to create a SPARQL endpoint, configuration variables are loaded using Config::JFDI. An example configuration file rdf_endpoint.json is included with this package. Valid top-level configuration keys include:


This is used to define the underlying RDF::Trine::Store for the endpoint. It can be a hashref of the type that can be passed to RDF::Trine::Store->new_with_config, but a simple string can also be used.


A hash of endpoint-specific configuration variables. Valid keys for this hash include:


A boolean value indicating whether Update operations should be allowed to be executed by the endpoint.


A boolean value indicating whether the endpoint should use URLs that appear in FROM and FROM NAMED clauses to construct a SPARQL dataset by dereferencing the URLs and loading the retrieved RDF content.


An associative array (hash) containing details on which and how much information to include in the service description provided by the endpoint if no query is included for execution. The boolean values 'default' and 'named_graphs' indicate that the respective SPARQL dataset graphs should be described by the service description.


An associative array (hash) containing details on how results should be serialized when the output media type is HTML. The boolean value 'resource_links' specifies whether URI values should be serialized as HTML anchors (links). The boolean value 'embed_images' specifies whether URI values that are typed as foaf:Image should be serialized as HTML images. If 'embed_images' is true, the integer value 'image_width' specifies the image width to be used in the HTML markup (letting the image height scale appropriately).


Using Plack::Handler::Apache2

Using Plack::Handler::Apache2, mod_perl2 can be configured to serve and endpoint using the following configuration:

  <Location /sparql>
    SetHandler perl-script
    PerlResponseHandler Plack::Handler::Apache2
    PerlSetVar psgi_app /path/to/endpoint.psgi
    PerlSetEnv RDF_ENDPOINT_CONFIG /path/to/rdf_endpoint.json

To get syntax highlighting and other pretty features, in the VirtualHost section of your server, add three aliases:

  Alias /js/ /path/to/share/www/js/
  Alias /favicon.ico /path/to/share/www/favicon.ico
  Alias /css/ /path/to/share/www/css/

The exact location can be determined by finding where the file sparql_form.js.


new ( \%conf )
new ( $model, \%conf )

Returns a new Endpoint object. \%conf should be a HASH reference with configuration settings.

run ( $req )

Handles the request specified by the supplied Plack::Request object, returning an appropriate Plack::Response object.


Returns a unique key for each instantiation of this service.

service_description ( $request, $model )

Returns a new RDF::Trine::Model object containing a service description of this endpoint, generating dataset statistics from $model.



 Gregory Todd Williams <gwilliams@cpan.org>


Copyright (c) 2010-2014 Gregory Todd Williams.

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

With the exception of the CodeMirror files, the files in this package may also be redistributed and/or modified under the same terms as Perl itself.

The CodeMirror (Javascript and CSS) files contained in this package are copyright (c) 2007-2010 Marijn Haverbeke, and licensed under the terms of the same zlib license as this code.