1DublinCore::Record(3) User Contributed Perl DocumentationDublinCore::Record(3)
2
3
4

NAME

6       DublinCore::Record - Container for Dublin Core metadata elements
7

SYNOPSIS

9           use DublinCore::Record;
10
11           my $record = DublinCore::Record->new();
12
13           # later ...
14
15           # print the title
16           print $record->element( 'title' )->content;
17
18           ## list context will retrieve all of a particular element
19           foreach my $element ( $record->element( 'Creator' ) ) {
20               print "creator: ", $element->content(), "\n";
21           }
22
23           ## qualified dublin core
24           my $creation = $record->element( 'Date.created' )->content();
25

DESCRIPTION

27       DublinCore::Record is an abstract class for manipulating DublinCore
28       metadata.  The Dublin Core is a small set of metadata elements for
29       describing information resources. For more information on embedding
30       DublinCore in HTML see RFC 2731 <http://www.ietf.org/rfc/rfc2731> or
31       <http://www.dublincore.org/documents/dces/>
32

METHODS

34   new()
35       The constructor. Takes no arguments.
36
37           $record = DublinCore::Record->new();
38
39   add( @elements )
40       Adds valid DublinCore::Element objects to the record.
41
42   remove( @elements )
43       Removes valid DublinCore::Element object from the record.
44
45   element()
46       This method will return a relevant DublinCore::Element object. When
47       called in a scalar context element() will return the first relevant
48       element found, and when called in a list context it will return all the
49       relevant elements (since Dublin Core elements are repeatable).
50
51           ## retrieve first title element
52           my $element = $record->element( 'Title' );
53           my $title = $element->content();
54
55           ## shorthand object chaining to extract element content
56           my $title = $record->element( 'Title' )->content();
57
58           ## retrieve all creator elements
59           @creators = $record->element( 'Creator' );
60
61       You can also retrieve qualified elements in a similar fashion.
62
63           my $date = $record->element( 'Date.created' )->content();
64
65       In order to fascilitate chaining element() will return an empty
66       DublinCore::Element object when the requested element does not exist.
67       You can check if you're getting an empty empty back by using the
68       is_empty() method.
69
70           if( $record->element( 'title' )->is_empty ) {
71               # no title
72           }
73
74   elements()
75       Returns all the Dublin Core elements found as DublinCore::Element
76       objects which you can then manipulate further.
77
78           foreach my $element ( $record->elements() ) {
79               print "name=", $element->name(), "\n";
80               print "content=", $element->content(), "\n";
81           }
82
83   title()
84       Returns a DublinCore::Element object for the title element. You can
85       then retrieve content, qualifier, scheme, lang attributes like so.
86
87           my $title = $record->title();
88           print "content:   ", $title->content(), "\n";
89           print "qualifier: ", $title->qualifier(), "\n";
90           print "scheme:    ", $title->scheme(), "\n";
91           print "language:  ", $title->language(), "\n";
92
93       Since there can be multiple instances of a particular element type
94       (title, creator, subject, etc) you can retrieve multiple title elements
95       by calling title() in a list context.
96
97           my @titles = $record->title();
98           foreach my $title ( @titles ) {
99               print "title: ", $title->content(), "\n";
100           }
101
102   creator()
103       Retrieve creator information in the same manner as title().
104
105   subject()
106       Retrieve subject information in the same manner as title().
107
108   description()
109       Retrieve description information in the same manner as title().
110
111   publisher()
112       Retrieve publisher  information in the same manner as title().
113
114   contributor()
115       Retrieve contributor information in the same manner as title().
116
117   date()
118       Retrieve date information in the same manner as title().
119
120   type()
121       Retrieve type information in the same manner as title().
122
123   format()
124       Retrieve format information in the same manner as title().
125
126   identifier()
127       Retrieve identifier information in the same manner as title().
128
129   source()
130       Retrieve source information in the same manner as title().
131
132   language()
133       Retrieve language information in the same manner as title().
134
135   relation()
136       Retrieve relation information in the same manner as title().
137
138   coverage()
139       Retrieve coverage information in the same manner as title().
140
141   rights()
142       Retrieve rights information in the same manner as title().
143

SEE ALSO

145       •   DublinCore::Element
146
147       •   Dublin Core <http://www.dublincore.org/>
148
149       •   RFC 2731 <http://www.ietf.org/rfc/rfc2731>
150
151       •   perl4lib <http://www.rice.edu/perl4lib>
152

AUTHOR

154       •   Ed Summers <ehs@pobox.com>
155
156       •   Brian Cassidy <bricas@cpan.org>
157

159       Copyright 2007 by Ed Summers, Brian Cassidy
160
161       This library is free software; you can redistribute it and/or modify it
162       under the same terms as Perl itself.
163
164
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166perl v5.36.0                      2022-07-22             DublinCore::Record(3)
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