Provided by: librdf-generator-http-perl_0.003-2_all 
NAME
RDF::Generator::HTTP - Generate RDF from a HTTP message
SYNOPSIS
use LWP::UserAgent;
my $ua = LWP::UserAgent->new;
my $response = $ua->get('http://search.cpan.org/');
use RDF::Generator::HTTP;
use RDF::Trine qw(iri);
my $g = RDF::Generator::HTTP->new(message => $response,
graph => iri('http://example.org/graphname'),
blacklist => ['Last-Modified', 'Accept']);
my $model = $g->generate;
print $model->size;
my $s = RDF::Trine::Serializer->new('turtle', namespaces =>
{ httph => 'http://www.w3.org/2007/ont/httph#',
http => 'http://www.w3.org/2007/ont/http#' } );
$s->serialize_model_to_file(\*STDOUT, $model);
DESCRIPTION
This module simply takes a HTTP::Message object, and based on its content, especially the
content the HTTP::Header object(s) it contains, creates a simple RDF representation of the
contents. It is useful chiefly for recording data when crawling resources on the Web, but
it may also have other uses.
Constructor
"new(%attributes)"
Moose-style constructor function.
Attributes
These attributes may be passed to the constructor to set them, or called like methods to
get them.
"message"
A HTTP::Message (or subclass thereof) object to generate RDF for. Required.
"blacklist"
An "ArrayRef" of header field names that you do not want to see in the output.
"whitelist"
An "ArrayRef" of the only header field names that you want to see in the output. The
whitelist will be ignored if the blacklist is set.
"graph"
You may pass an optional graph name to be used for all triples in the output. This
must be an object of RDF::Trine::Node::Resource.
"ns"
An URI::NamespaceMap object containing namespace prefixes used in the module. You
should probably not override this even though you can.
"request_subject"
An RDF::Trine::Node object containing the subject of any statements describing
requests. If unset, it will default to a blank node.
"response_subject"
An RDF::Trine::Node object containing the subject of any statements describing
responses. If unset, it will default to a blank node.
Methods
The above attributes all have read-accessors by the same name. "blacklist", "whitelist"
and "graph" also has writers and predicates, which is used to test if the attribute has
been set, by prefixing "has_" to the attribute name.
This class has two methods:
"generate ( [ $model ] )"
This method will generate the RDF. It may optionally take an RDF::Trine::Model as
parameter. If it exists, the RDF will be added to this model, if not, a new Memory
model will be created and returned.
"ok_to_add ( $field )"
This method will look up in the blacklists and whitelists and return true if the given
field and value may be added to the model.
EXAMPLES
For an example of what the module can be used to create, consider the example in the
"SYNOPSIS", which at the time of this writing outputs the following Turtle:
@prefix http: <http://www.w3.org/2007/ont/http#> .
@prefix httph: <http://www.w3.org/2007/ont/httph#> .
[] a http:RequestMessage ;
http:hasResponse [
a http:ResponseMessage ;
http:status "200" ;
httph:client_date "Sun, 14 Dec 2014 21:28:21 GMT" ;
httph:client_peer "207.171.7.59:80" ;
httph:client_response_num "1" ;
httph:connection "close" ;
httph:content_length "3643" ;
httph:content_type "text/html" ;
httph:date "Sun, 14 Dec 2014 21:28:21 GMT" ;
httph:link "<http://search.cpan.org/uploads.rdf>; rel=\"alternate\"; title=\"RSS 1.0\"; type=\"application/rss+xml\"", "<http://st.pimg.net/tucs/opensearch.xml>; rel=\"search\"; title=\"SearchCPAN\"; type=\"application/opensearchdescription+xml\"", "<http://st.pimg.net/tucs/print.css>; media=\"print\"; rel=\"stylesheet\"; type=\"text/css\"", "<http://st.pimg.net/tucs/style.css?3>; rel=\"stylesheet\"; type=\"text/css\"" ;
httph:server "Plack/Starman (Perl)" ;
httph:title "The CPAN Search Site - search.cpan.org" ;
httph:x_proxy "proxy2"
] ;
http:method "GET" ;
http:requestURI <http://search.cpan.org/> ;
httph:user_agent "libwww-perl/6.05" .
NOTES
HTTP Vocabularies
There have been many efforts to create HTTP vocabularies (or ontologies), where the most
elaborate and complete is the HTTP Vocabulary in RDF 1.0 <http://www.w3.org/TR/HTTP-in-
RDF/>. Nevertheless, I decided not to support this, but rather support an older and much
less complete vocabulary that has been in the Tabulator
<https://github.com/linkeddata/tabulator-firefox> project, with the namespace prefixes
<http://www.w3.org/2007/ont/http#> and <http://www.w3.org/2007/ont/httph#>. The problem of
modelling HTTP is that headers modify each other, so if you want to record the HTTP
headers so that they can be used in an actual HTTP dialogue afterwards, they have to be in
a container so that the order can be reconstructed. Moreover, there is a lot of
microstructure in the values, and that also adds complexity if you want to translate all
that to RDF. That's what the former vocabulary does. However, for now, all the author
wants to do is to record them, and then neither of these concerns are important.
Therefore, I opted to go for a much simpler vocabulary, where each field is a simple
predicate. That is not to say that the former approach isn't valid, it is just not
something I need now.
BUGS
This is a very early release, but it works for the author.
Please report any bugs to <https://github.com/kjetilk/p5-rdf-generator-http/issues>.
AUTHOR
Kjetil Kjernsmo <kjetilk@cpan.org>.
COPYRIGHT AND LICENCE
This software is copyright (c) 2014 by Kjetil Kjernsmo.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
PURPOSE.