NAME PICA::Data - PICA record processing SYNOPSIS use PICA::Data ':all'; $parser = pica_parser( xml => 'picadata.xml' ); $writer = pica_writer( plain => \*STDOUT ); use PICA::Parser::XML; use PICA::Writer::Plain; $parser = PICA::Parser::XML->new( @options ); $writer = PICA::Writer::Plain->new( @options ); # parse records while ( my $record = $parser->next ) { # function accessors my $ppn = pica_value($record, '003@0'); my $holdings = pica_holdings($record); my $items = pica_items($record); ... # object accessors (if parser option 'bless' enabled) my $ppn = $record->{_id}; my $ppn = $record->value('003@0'); my $holdings = $record->holdings; my $items = $record->items; ... # write record $writer->write($record); # write record via method (if blessed) $record->write($writer); $record->write( xml => @options ); $record->write; # default "plain" writer # stringify record my $plain = $record->string; my $xml = $record->string('xml'); } # parse single record from string my $record = pica_parser('plain', \"...")->next; DESCRIPTION PICA::Data provides methods, classes, and functions to process PICA+ records in Perl. PICA+ is the internal data format of the Local Library System (LBS) and the Central Library System (CBS) of OCLC, formerly PICA. Similar library formats are the MAchine Readable Cataloging format (MARC) and the Maschinelles Austauschformat fuer Bibliotheken (MAB). In addition to PICA+ in CBS there is the cataloging format Pica3 which can losslessly be convert to PICA+ and vice versa. Records in PICA::Data are encoded either as array of arrays, the inner arrays representing PICA fields, or as an object with two fields, "_id" and "record", the latter holding the record as array of arrays, and the former holding the record identifier, stored in field "003@", subfield 0. For instance a minimal record with just one field "003@": { _id => '12345X', record => [ [ '003@', undef, '0' => '12345X' ] ] } or in short form: [ [ '003@', undef, '0' => '12345X' ] ] PICA path expressions (see PICA::Path) can be used to facilitate processing PICA+ records. FUNCTIONS The following functions can be exported on request (use export tag ":all" to get all of them): pica_parser( $type [, @options] ) Create a PICA parsers object (see PICA::Parser::Base). Case of the type is ignored and additional parameters are passed to the parser's constructor: * PICA::Parser::Plus for type "plus" or "picaplus" (normalized PICA+) * PICA::Parser::Plain for type "plain" or "picaplain" (human-readable PICA+) * PICA::Parser::XML for type "xml" or "picaxml" (PICA-XML) * PICA::Parser::PPXML for type "ppxml" (PicaPlus-XML) pica_xml_struct( $xml, %options ) Convert PICA-XML, expressed in XML::Struct structure into an (optionally blessed) PICA record structure. pica_writer( $type [, @options] ) Create a PICA writer object (see PICA::Writer::Base) in the same way as "pica_parser" with one of * PICA::Writer::XML for type "xml" or "picaxml" (PICA-XML) * PICA::Writer::Plus for type "plus" or "picaplus" (normalized PICA+) * PICA::Writer::Plain for type "plain" or "picaplain" (human-readable PICA+) pica_path( $path ) Equivalent to PICA::Path->new($path). pica_value( $record, $path ) Extract the first subfield values from a PICA record based on a PICA path expression. Also available as accessor "value($path)". pica_values( $record, $path ) Extract a list of subfield values from a PICA record based on a PICA path expression. The following are virtually equivalent: pica_values($record, $path); $path->record_subfields($record); $record->values($path); # if $record is blessed pica_fields( $record, $path ) Returns a PICA record (or empty array reference) limited to fields specified in a PICA path expression. The following are virtually equivalent: pica_fields($record, $path); $path->record_fields($record); $record->fields($path); # if $record is blessed pica_holdings( $record ) Returns a list (as array reference) of local holding records. Also available as accessor "holdings". pica_items( $record ) Returns a list (as array reference) of item records. Also available as accessor "items". ACCESSORS All accessors of "PICA::Data" are also available as "FUNCTIONS", prefixed with "pica_" (see "SYNOPSIS"). values( $path ) Extract a list of subfield values from a PICA record based on a PICA::Path expression. value( $path ) Same as "values" but only returns the first value. fields( $path ) Returns a PICA record limited to fields specified in a PICA::path expression. Always returns an array reference. holdings Returns a list (as array reference) of local holding records (level 1 and 2), where the "_id" of each record contains the ILN (subfield "101@a"). items Returns a list (as array reference) of item records (level 1), where the "_id" of each record contains the EPN (subfield "203@/**0"). METHODS write( [ $type [, @options] ] | $writer ) Write PICA record with given PICA::Writer::Base or PICA::Writer::Plain by default. This method is a shortcut for blessed record objects: pica_writer( xml => $file )->write( $record ); $record->write( xml => $file ); # equivalent if $record is blessed CONTRIBUTORS Johann Rolschewski, "" Jakob Voss "" COPYRIGHT AND LICENSE Copyright 2014- Johann Rolschewski and Jakob Voss This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO * PICA::Record (deprecated) implemented an alternative framework for processing PICA+ records. * Use Catmandu::PICA for processing PICA records with the Catmandu toolkit, for instance to convert PICA XML to plain PICA+: catmandu convert PICA --type xml to PICA --type plain < picadata.xml