NAME¶
RDF::Generator::Void - Generate VoID descriptions based on data in an RDF model
VERSION¶
Version 0.13
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 "<kjetilk@cpan.org>" Toby Inkster
"<tobyink@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::Semantics.
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 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.