NAME
    RDF::Query::Functions::Buzzword::Util - plugin for buzzword.org.uk
    utility functions

SYNOPSIS
      use RDF::TrineShortcuts qw[:all];
      use Data::Dumper;
  
      my $data = rdf_parse(<<'TURTLE', type=>'turtle');
      @prefix foaf: <http://xmlns.com/foaf/0.1/> .
      @prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
  
      <http://tobyinkster.co.uk/#i>
        foaf:name  "Toby Inkster" ;
        foaf:phone "0123456789 ext 1234" .
      TURTLE
  
      $r = rdf_query(<<'SPARQL', $data);
      PREFIX foaf: <http://xmlns.com/foaf/0.1/>
      PREFIX gb: <http://buzzword.org.uk/2011/functions/gb#>
      SELECT
        ?name
        (gb:telephone_uri(?phone) AS ?phoneuri)
      WHERE
      {
        ?person foaf:name ?name ; foaf:phone ?phone .
      }
      SPARQL
  
      print Dumper(flatten_iterator($r, literal_as=>'ntriples'));

DESCRIPTION
    This is a plugin for RDF::Query providing a number of extension
    functions.

    *   http://buzzword.org.uk/2011/functions/gb#postcode_valid

        Given a literal, returns a boolean indicating whether it seems to be
        a syntactically valid UK postcode.

    *   http://buzzword.org.uk/2011/functions/gb#postcode_format

        Given a literal, if it seems to be a valid UK postcode,
        canonicalises the formatting; otherwise returns the literal
        unscathed.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_valid

        Given a literal, returns a boolean indicating whether it seems to be
        a number that could be dialed from a UK phone.

        Only the digits '0' to '9', letter 'x' (extension) and '+'
        (international dialing code) are expected. Other characters are
        stripped out before any checks.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_format

        Canonicalises the formatting of a phone number that is valid. Should
        return invalid phone numbers unscathed.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_std

        Returns the STD code for a phone number, if it could be extracted;
        the empty string otherwise.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_local

        Returns the local part of a phone number, if it could be extracted;
        the empty string otherwise.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_extension

        Returns the extension from a phone number, if it could be extracted;
        the empty string otherwise.

    *   http://buzzword.org.uk/2011/functions/gb#telephone_uri

        Returns a phone number as a <tel:> URI.

        An existing <tel:> URI should pass through unscathed.

SEE ALSO
    RDF::Query.

    <http://perlrdf.org/>.

AUTHOR
    Toby Inkster <tobyink@cpan.org>.

COPYRIGHT
    Copyright 2004-2011 Toby Inkster

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.