Provided by: librdf-linkeddata-perl_1.02-1_all 
NAME
RDF::LinkedData - A Linked Data server implementation
VERSION
Version 1.02
SYNOPSIS
For just setting this up and get it to run, you would just use the "linked_data.psgi"
script in this distribution. The usage of that is documented in
Plack::App::RDF::LinkedData, with the README being a quick start guide. If you want to try
and use this directly, you'd do stuff like:
my $ld = RDF::LinkedData->new(store => $config->{store},
endpoint_config => $config->{endpoint},
base_uri => $config->{base_uri}
);
$ld->namespaces($config->{namespaces}) if ($config->{namespaces});
$ld->request($req);
return $ld->response($uri)->finalize;
See Plack::App::RDF::LinkedData for a complete example.
DESCRIPTION
This module is used to create a Linked Data server that can serve RDF data out of an
RDF::Trine::Model. It will look up URIs in the model and do the right thing (known as the
303 dance) and mint URLs for that, as well as perform content negotiation. Thus, you can
concentrate on URIs for your things, and you need not be concerned about minting URLs for
the pages to serve it. In addition, optional modules can provide other important
functionality: Cross-origin resource sharing, VoID description, cache headers, SPARQL
Endpoint, Triple Pattern Fragments, etc. As such, it encompasses a fair share of Semantic
Web best practices, but possibly not in a very flexible "Big Data" manner.
METHODS
"new ( store => $store, model => $model, base_uri => $base_uri, hypermedia => 1,
namespaces_as_vocabularies => 1, request => $request, endpoint_config => $endpoint_config,
void_config => $void_config )"
Creates a new handler object based on the named parameters, given a store config
(recommended usage is to pass a hashref of the type that can be passed to
RDF::Trine::Store->new_with_config, but a simple string can also be used) or a model
and a base URI. Optionally, you may pass a Plack::Request object (which must be passed
before you call "content") and an "endpoint_config" hashref if you want to have a
SPARQL Endpoint running using the recommended module RDF::Endpoint.
This module can also provide additional triples to turn the response into a hypermedia
type. If you don't want this, set the "hypermedia" argument to false. Currently this
entails setting the SPARQL endpoint and vocabularies used using the VoID vocabulary
<http://vocab.deri.ie/void>.
Finally, it can provide experimental Triple Pattern Fragments <http://www.hydra-
cg.com/spec/latest/triple-pattern-fragments/> support.
"BUILD"
Called by Moo to initialize an object.
"BUILDARGS"
Called by Moo to ensure that some attributes can be left unset.
"model"
Returns the RDF::Trine::Model object.
"base_uri"
Returns or sets the base URI for this handler.
"request ( [ $request ] )"
Returns the Plack::Request object, if it exists; or sets it if a Plack::Request object
is given as parameter.
"current_etag"
Returns the current Etag of the model suitable for use in a HTTP header. This is a
read-only attribute.
"last_etag", "has_last_etag"
Returns or sets the last Etag of so that changes to the model can be detected.
namespaces ( $namespace_map )
Gets or sets the namespaces that some serializers use for pretty-printing. Should be
handed a URI::NamespaceMap object.
"response ( $uri )"
Will look up what to do with the given URI object and populate the response object.
"helper_properties ( )"
Returns the RDF::Helper::Properties object. if it exists; or sets it if an
RDF::Helper::Properties object is given as a parameter.
"type"
Returns or sets the type of result to return, i.e. "page", in the case of a human-
intended page or "data" for machine consumption, or an empty string if it is an actual
resource URI that should be redirected.
"my_node"
A node for the requested URI. This node is typically used as the subject to find which
statements to return as data. This expects to get a URI object containing the full URI
of the node.
"count ( $node)"
Returns the number of statements that has the $node as subject, or all if $node is
undef.
"endpoint ( [ $endpoint ] )"
Returns the RDF::Endpoint object if it exists or sets it if a RDF::Endpoint object is
given as parameter. In most cases, it will be created for you if you pass a
"endpoint_config" hashref to the constructor, so you would most likely not use this
method.
"void ( [ $voidg ] )"
Returns the RDF::Generator::Void object, if it exists; or sets it if an
RDF::Generator::Void object is given as parameter. Like "endpoint", it will be created
for you if you pass a "void_config" hashref to the constructor, so you would most
likely not use this method.
AUTHOR
Kjetil Kjernsmo, "<kjetilk@cpan.org>"
CONTRIBUTORS
Toby Inkster
BUGS
Please report any bugs using github <https://github.com/kjetilk/RDF-LinkedData/issues>
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc RDF::LinkedData
The perlrdf mailing list is the right place to seek help and discuss this module:
<http://lists.perlrdf.org/listinfo/dev>
TODO
This module does what it is supposed to do rather well and has thus reached the 1.0
milestone. To support a wider variety of use cases, the current module isn't flexible
enough, so future versions will need substantial changes, but the version number is
intended to reflect that.
ACKNOWLEDGMENTS
This module was started by Gregory Todd Williams "<gwilliams@cpan.org>" for
RDF::LinkedData::Apache, but has been almost totally rewritten.
COPYRIGHT & LICENSE
Copyright 2010 Gregory Todd Williams
Copyright 2010 ABC Startsiden AS
Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Kjetil Kjernsmo
This program is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.