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package SemanticWeb::OAI::ORE::TriX; |
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#$Id: TriX.pm,v 1.13 2010-12-06 14:44:15 simeon Exp $ |
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=head1 NAME |
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SemanticWeb::OAI::ORE::TriX - Parse/serialize OAI-ORE Resource Maps in TriX format |
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=head1 SYNPOSIS |
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Module to parse and serialize OAI-ORE ReMs in TriX format. |
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=head1 DESCRIPTION |
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The TriX format is describe at L |
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=cut |
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use strict; |
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use warnings; |
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use Carp; |
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use SemanticWeb::OAI::ORE::ReM; |
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use XML::Writer; |
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=head1 METHODS |
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=head2 Creator |
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=head3 new(%args) |
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=cut |
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sub new { |
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my $class=shift; |
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my $self={@_}; |
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bless $self, (ref($class) || $class); |
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return($self); |
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} |
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=head2 Output |
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=head3 serialize() |
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Seialize in TriX format, returns serializetion as a string. |
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=cut |
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sub serialize { |
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my $self=shift; |
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my $out=''; |
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my $rem=$self->{rem}; |
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if (ref($rem) and $rem->isa('SemanticWeb::OAI::ORE::ReM')) { |
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# Get the info from the ReM |
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my $name=$rem->name(); |
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# create an XML writer |
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my $writer=XML::Writer->new('OUTPUT'=>\$out,'DATA_MODE'=>1,'DATA_INDENT'=>1); |
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$writer->startTag('trix', |
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'xmlns'=>'http://www.w3.org/2004/03/trix/trix-1/', |
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'xmlns:ore'=>'http://www.openarchives.org/ORE'); |
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# http://www.w3.org/2004/03/trix/trix-1/trix-1.0.xsd |
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$writer->startTag('graph'); |
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# write name |
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$writer->dataElement('uri',$name); |
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# write metadata |
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$writer->comment('required metadata'); |
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write_triple($writer,$name,'ore:remTimeStamp',$rem->timestamp_as_iso8601()); |
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write_triple($writer,$name,'ore:remAuthority',$rem->authority()); |
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# write aggregated resources |
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$writer->comment('aggregated resources'); |
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foreach my $uri ($rem->aggregated_resources()) { |
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write_triple($writer,$name,'ore:aggregates',$uri); |
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} |
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# write relations |
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$writer->comment('rels'); |
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foreach my $rel (@{$rem->rels->as_array()}) { |
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write_triple($writer,@$rel); |
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} |
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$writer->endTag('graph'); |
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$writer->endTag('trix'); |
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$writer->end(); |
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} else { |
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carp "Can't serialize something that isn't a rem: $rem, ".ref($rem)."\n"; |
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} |
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return($out); |
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} |
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=head2 SUBROUTINES |
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=head3 write_triple($writer,$subject,$predicate,$object) |
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Write the ($subject,$predicate,$object) to $writer. |
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=cut |
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sub write_triple { |
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my ($writer,$subject,$predicate,$object)=@_; |
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$writer->startTag('triple'); |
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# Subject and object may be id, uri, plainLiteral or typedLiteral |
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$writer->dataElement('uri',$subject); |
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$writer->dataElement('uri',$predicate); |
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$writer->dataElement('uri',$object); |
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$writer->endTag('triple'); |
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} |
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=head1 SEE ALSO |
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L |
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=head1 AUTHORS |
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Simeon Warner |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2007-2010 Simeon Warner. |
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This module is free software; you can redistribute it and/or |
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modify it under the same terms as Perl itself. See L. |
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=cut |
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1; |