RDF::GENERATOR::VOID(3PM) - man page online | library functions

Generate VoID descriptions based on data in an RDF model.

Chapter

2016-02-14

RDF::Generator::Void(3pm) User Contributed Perl Documentation RDF::Generator::Void(3pm)

NAME
RDF::Generator::Void - Generate VoID descriptions based on data in an RDF model

VERSION
Version 0.16

SYNOPSIS
use RDF::Generator::Void;
use RDF::Trine::Model;
my $mymodel = RDF::Trine::Model->temporary_model;
[add some data to $mymodel here]
my $generator = RDF::Generator::Void->new(inmodel => $mymodel);
$generator->urispace('http://example.org');
$generator->add_endpoints('http://example.org/sparql');
my $voidmodel = $generator->generate;

DESCRIPTION
This module takes a RDF::Trine::Model object as input to the constructor, and based on the
data in that model as well as data supplied by the user, it creates a new model with a
VoID description of the data in the model.

For a description of VoID, see <http://www.w3.org/TR/void/>.

METHODS
new(inmodel => $mymodel, dataset_uri => URI->new($dataset_uri), level => 1);
The constructor. It can be called with two parameters, namely, "inmodel" which is a model
we want to describe and "dataset_uri", which is the URI we want to use for the
description. Users should make sure it is possible to get this with HTTP. If this is not
possible, you may leave this field empty so that a simple URN can be created for you as a
default.

"inmodel"
Read-only accessor for the model used in description creation.

"dataset_uri"
Read-only accessor for the URI to the dataset.

Property Attributes
The below attributes concern some essential properties in the VoID vocabulary. They are
mostly arrays, and can be manipulated using array methods. Methods starting with "all_"
will return an array of unique values. Methods starting with "add_" takes a list of values
to add, and those starting with "has_no_" return a boolean value, false if the array is
empty.

"all_vocabularies", "add_vocabularies", "has_no_vocabularies"

Methods to manipulate a list of vocabularies used in the dataset. The values should be a
string that represents the URI of a vocabulary.

"all_endpoints", "add_endpoints", "has_no_endpoints"

Methods to manipulate a list of SPARQL endpoints that can be used to query the dataset.
The values should be a string that represents the URI of a SPARQL endpoint.

"all_titles", "add_titles", "has_no_titles"

Methods to manipulate the titles of the datasets. The values should be
RDF::Trine::Node::Literal objects, and should be set with language. Typically, you would
have a value per language.

"all_licenses", "add_licenses", "has_no_licenses"

Methods to manipulate a list of licenses that regulates the use of the dataset. The values
should be a string that represents the URI of a license.

"urispace", "has_urispace"

This method is used to set the URI prefix string that will match the entities in your
dataset. The computation of the number of entities depends on this being set.
"has_urispace" can be used to check if it is set.

Running this stuff
"level", "has_level"

Set the level of detail. 0 doesn't do any statistics or heuristics, 1 has some statistics
for the dataset as a whole, 2 will give some partition statistics and 3 will give subject
and object counts for property partitions. Setting no level will give everything.

"stats", "clear_stats", "has_stats"

Method to compute a statistical summary for the data in the dataset, such as the number of
entities, predicates, etc. "clear_stats" will clear the statistics and "has_stats" will
return true if exists.

generate( [ $model ] )

Returns the VoID as an RDF::Trine::Model. You may pass a model with statements as argument
to this method. This model may then contain arbitrary RDF that will be added to the RDF
model. If you do not send a model, one will be created for you.

AUTHORS
Kjetil Kjernsmo "<@cpan.org>" Toby Inkster "<@cpan.org>"

TODO
· URI regexps support.

· Technical features (esp. serializations).

· Example resources and root resources.

· Data dumps.

· Subject classification.

· Method to disable heuristics.

· More heuristics.

· Linkset descriptions.

· Set URI space on partitions.

· Use CHI to cache?

· Use schema introspection to generate property attributes with MooseX::Semantic.

BUGS
Please report any bugs you find to <https://github.com/kjetilk/RDF-Generator-Void/issues>

Note that any claim that this module will generate a void in spacetime, a wormhole, black
hole, or funny philosophy is totally bogus and without any scientific merit whatsoever.
The lead author has made elaborate precautions to avoid any such issues, and expects
everyone to take his word for it. Oh, BTW, should it just happen anyway, it won't hurt
much <http://news.sciencemag.org/sciencenow/2012/03/scienceshot-one-black-hole-
wont-.html>.

SUPPORT
You can find documentation for this module with the perldoc command.

perldoc RDF::Generator::Void

The Perl and RDF community website is at <http://www.perlrdf.org/> where you can also find
a mailing list to direct questions to.

You can also look for information at:

· AnnoCPAN: Annotated CPAN documentation

<http://annocpan.org/dist/RDF-Generator-Void>

· CPAN Ratings

<http://cpanratings.perl.org/d/RDF-Generator-Void>

· MetaCPAN

<https://metacpan.org/module/RDF::Generator::Void>

ACKNOWLEDGEMENTS
Many thanks to Konstantin Baierer for help with
RDF::Generator::Void::Meta::Attribute::ObjectList.

LICENSE AND COPYRIGHT
Copyright 2012 Toby Inkster. Copyright 2012,2013,2016 Kjetil Kjernsmo.

This program is free software; you can redistribute it and/or modify it under the terms of
either: the GNU General Public License as published by the Free Software Foundation; or
the Artistic License.

See http://dev.perl.org/licenses/ for more information.

perl v5.22.1 2016-02-14 RDF::Generator::Void(3pm)