SIMPLE SOLUTIONS

RDF::ENDPOINT - reference manual online

A SPARQL Protocol Endpoint implementation.

Chapter
2014-08-05
RDF::Endpoint(3pm)             User Contributed Perl Documentation             RDF::Endpoint(3pm)

NAME RDF::Endpoint - A SPARQL Protocol Endpoint implementation
VERSION This document describes RDF::Endpoint version 0.07.
SYNOPSIS plackup /usr/local/bin/endpoint.psgi
DESCRIPTION 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: store 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. endpoint A hash of endpoint-specific configuration variables. Valid keys for this hash include: update A boolean value indicating whether Update operations should be allowed to be executed by the endpoint. load_data 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. service_description 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. html 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).
EXAMPLE CONFIGURATIONS 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 </Location> 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".
METHODS "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. "run_tag" 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.
SEE ALSO · <http://www.w3.org/TR/sparql11-protocol/> · <http://www.perlrdf.org/> · <irc://irc.perl.org/#perlrdf> · <http://codemirror.net/>
AUTHOR Gregory Todd Williams <@cpan.org>
perl v5.18.2 2014-08-05 RDF::Endpoint(3pm)