# NAME PICA::Data - PICA record processing [![Unix build Status](https://travis-ci.org/gbv/PICA-Data.png)](https://travis-ci.org/gbv/PICA-Data) [![Windows build status](https://ci.appveyor.com/api/projects/status/5qjak74x7mjy7ne6?svg=true)](https://ci.appveyor.com/project/nichtich/pica-data) [![Coverage Status](https://coveralls.io/repos/gbv/PICA-Data/badge.svg)](https://coveralls.io/r/gbv/PICA-Data) [![Kwalitee Score](http://cpants.cpanauthors.org/dist/PICA-Data.png)](http://cpants.cpanauthors.org/dist/PICA-Data) # 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 $ppn = pica_match($record, '045Ue', split => 1, nested_array => 1); 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 $ddc = $record->match('045Ue', split => 1, nested_array => 1); 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, functions, and [a command line application](https://metacpan.org/pod/picadata) to process [PICA+ records](http://format.gbv.de/pica). 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](https://metacpan.org/pod/PICA::Path)) can be used to facilitate processing PICA+ records and [PICA::Schema](https://metacpan.org/pod/PICA::Schema) can be used to validate PICA+ records with [Avram Schemas](https://format.gbv.de/schema/avram/specification). # 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](https://metacpan.org/pod/PICA::Parser::Base)). Case of the type is ignored and additional parameters are passed to the parser's constructor: - [PICA::Parser::Binary](https://metacpan.org/pod/PICA::Parser::Binary) for type `binary` (binary PICA+) - [PICA::Parser::Plain](https://metacpan.org/pod/PICA::Parser::Plain) for type `plain` or `picaplain` (human-readable PICA+) - [PICA::Parser::Plus](https://metacpan.org/pod/PICA::Parser::Plus) for type `plus` or `picaplus` (normalized PICA+) - [PICA::Parser::JSON](https://metacpan.org/pod/PICA::Parser::JSON) for type `json` (PICA JSON) - [PICA::Parser::XML](https://metacpan.org/pod/PICA::Parser::XML) for type `xml` or `picaxml` (PICA-XML) - [PICA::Parser::PPXML](https://metacpan.org/pod/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](https://metacpan.org/pod/XML::Struct) structure into an (optionally blessed) PICA record structure. ## pica\_writer( $type \[, @options\] ) Create a PICA writer object (see [PICA::Writer::Base](https://metacpan.org/pod/PICA::Writer::Base)) in the same way as `pica_parser` with one of - [PICA::Writer::Binary](https://metacpan.org/pod/PICA::Writer::Binary) for type `binary` (binary PICA) - [PICA::Writer::Generic](https://metacpan.org/pod/PICA::Writer::Generic) for type `generic` (PICA with self defined data separators) - [PICA::Writer::Plain](https://metacpan.org/pod/PICA::Writer::Plain) for type `plain` or `picaplain` (human-readable PICA+) - [PICA::Writer::Plus](https://metacpan.org/pod/PICA::Writer::Plus) for type `plus` or `picaplus` (normalized PICA+) - [PICA::Writer::JSON](https://metacpan.org/pod/PICA::Writer::JSON) for type `json` (PICA JSON) - [PICA::Writer::XML](https://metacpan.org/pod/PICA::Writer::XML) for type `xml` or `picaxml` (PICA-XML) - [PICA::Writer::PPXML](https://metacpan.org/pod/PICA::Writer::PPXML) for type `ppxml` (PicaPlus-XML) - [PICA::Writer::Fields](https://metacpan.org/pod/PICA::Writer::Fields) for type `fields` (summary of used fields and subfields) ## pica\_string( $record \[, $type \[, @options\] \] ) Stringify a record with given writer (`plain` as default) and options. ## pica\_path( $path ) Equivalent to [PICA::Path](https://metacpan.org/pod/PICA::Path)->new($path). ## pica\_match( $record, $path, %options ) Equivalent to [PICA::Path](https://metacpan.org/pod/PICA::Path)->match\_record($path, %options). Extract the subfield values from a PICA record based on a PICA path expression and options (see [PICA::Path](https://metacpan.org/pod/PICA::Path)). Also available as accessor `match($path, %options)`. ## 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\[, $path...\] ) Returns a PICA record (or empty array reference) limited to fields specified in one ore more 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"](#functions), prefixed with `pica_` (see ["SYNOPSIS"](#synopsis)). ## match( $path, %options ) Extract a list of subfield values from a PICA record based on a [PICA::Path](https://metacpan.org/pod/PICA::Path) expression and options. ## values( $path ) Extract a list of subfield values from a PICA record based on a [PICA::Path](https://metacpan.org/pod/PICA::Path) expression. ## value( $path ) Same as `values` but only returns the first value. ## fields( $path\[, $path...\] ) Returns a PICA record limited to fields specified in a [PICA::Path](https://metacpan.org/pod/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::...](https://metacpan.org/pod/PICA::Writer::Base) or [PICA::Writer::Plain](https://metacpan.org/pod/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). This method can also be used as function `pica_string`. # 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 - [picadata](https://metacpan.org/pod/picadata) command line script to parse, serialize, count, and validate PICA+ data. - Use [Catmandu::PICA](https://metacpan.org/pod/Catmandu::PICA) for more elaborated processing of PICA records with the [Catmandu](https://metacpan.org/pod/Catmandu) toolkit. - [PICA::Record](https://metacpan.org/pod/PICA::Record) implemented an alternative framework for processing PICA+ records (**deprecated!**).