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 ); use PICA::Schema; $schema = PICA::Schema->new(); # 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'); # validate record my $errors = $schema->check($record); } # parse single record from string my $record = pica_parser('plain', \"...")->next; # guess parser from input string my $parser = pica_guess($string)->new(\$string); 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 keys, _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 (having tag 003@ and no occurrence): { _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 and PICA::Schema to validate 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::Binary for type binary (binary PICA+) * PICA::Parser::Plain for type plain or picaplain (human-readable PICA+) * PICA::Parser::Plus for type plus or picaplus (normalized PICA+) * PICA::Parser::XML for type xml or picaxml (PICA-XML) * PICA::Parser::PPXML for type ppxml (PicaPlus-XML) pica_guess( $data ) Guess PICA serialization format from input data. Returns name of the corresponding parser class or undef. 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::Binary for type binary (binary PICA) * PICA::Writer::Generic for type generic (PICA with self defined data separators) * PICA::Writer::Plain for type plain or picaplain (human-readable PICA+) * PICA::Writer::Plus for type plus or picaplus (normalized PICA+) * PICA::Writer::XML for type xml or picaxml (PICA-XML) * PICA::Writer::PPXML for type ppxml (PicaPlus-XML) 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 string( [ $type ] ) Serialize PICA record in a given format (plain by default). CONTRIBUTORS Johann Rolschewski, Jakob Voß Carsten Klee 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