Bio::Biblio::IO(3) User Contributed Perl Documentation Bio::Biblio::IO(3)NAMEBio::Biblio::IO - Handling the bibliographic references
SYNOPSIS
use Bio::Biblio::IO;
# getting citations from a file
$in = Bio::Biblio::IO->new ('-file' => 'myfile.xml' ,
'-format' => 'medlinexml');
# --- OR ---
# getting citations from a string
$in = Bio::Biblio::IO->new ('-data' => '<MedlineCitation>...</MedlineCitation>' ,
'-format' => 'medlinexml');
#--- OR ---
# getting citations from a string if IO::String is installed
use IO::String;
$in = Bio::Biblio::IO->new ('-fh' => IO::String->new ($citation),
'-format' => 'medlinexml');
$in = Bio::Biblio::IO->new(-fh => $io_handle , '-format' => 'medlinexml');
#--- OR ---
# getting citations from any IO handler
$in = Bio::Biblio::IO->new('-fh' => $io_handle ,
'-format' => 'medlinexml');
# now, having $in, we can read all citations
while ( my $citation = $in->next_bibref() ) {
&do_something_with_citation ($citation);
}
#--- OR ---
# again reading all citation but now a callback defined in your
# code is used (note that the reading starts already when new()
# is called)
$io = Bio::Biblio::IO->new('-format' => 'medlinexml',
'-file' => $testfile,
'-callback' => \&callback);
sub callback {
my $citation = shift;
print $citation->{'_identifier'} . "\n";
}
#Now, to actually get a citation in an XML format,
#use I<Bio::Biblio> module which returns an XML string:
use Bio::Biblio;
use Bio::Biblio::IO;
my $xml = Bio::Biblio->new->get_by_id ('12368254');
my $reader = Bio::Biblio::IO->new ('-data' => $xml,
'-format' => 'medlinexml');
while (my $citation = $reader->next_bibref()) {
#... do something here with $citation
}
#And, finally, the resulting citation can be received in different
#output formats:
$io = Bio::Biblio::IO->new('-format' => 'medlinexml',
'-result' => 'raw');
#--- OR ---
$io = Bio::Biblio::IO->new('-format' => 'medlinexml',
'-result' => 'medline2ref');
#--- OR ---
$io = Bio::Biblio::IO->new('-format' => 'pubmedxml',
'-result' => 'pubmed2ref');
DESCRIPTIONBio::Biblio::IO is a handler module for accessing bibliographic
citations. The citations can be in different formats - assuming that
there is a corresponding module knowing that format in Bio::Biblio::IO
directory (e.g. Bio::Biblio::IO::medlinexml). The format (and the
module name) is given by the argument -format.
Once an instance of "Bio::Biblio::IO" class is available, the citations
can be read by calling repeatedly method next_bibref:
while (my $citation = $reader->next_bibref()) {
... do something here with $citation
}
However, this may imply that all citations were already read into the
memory. If you expect a huge amount of citations to be read, you may
choose a callback option. Your subroutine is specified in the "new()"
method and is called everytime a new citation is available (see an
example above in SYNOPSIS).
The citations returned by next_bibref or given to your callback routine
can be of different formats depending on the argument -result. One
result type is raw and it is represented by a simple, not blessed hash
table:
$io = Bio::Biblio::IO->new('-result' => 'raw');
What other result formats are available depends on the module who reads
the citations in the first place. At the moment, the following ones are
available:
$io = Bio::Biblio::IO->new('-result' => 'medline2ref');
This is a default result format for reading citations by the medlinexml
module. The "medlinexml" module is again the default one. Which means
that you can almost omit arguments (you still need to say where the
citations come from):
$io = Bio::Biblio::IO->new('-file' => 'data/medline_data.xml');
Another result format available is for PUBMED citations (which is a
super-set of the MEDLINE citations having few more tags):
$io = Bio::Biblio::IO->new('-format' => 'pubmedxml',
'-result' => 'pubmed2ref',
'-data' => $citation);
Or, because "pubmed2ref" is a default one for PUBMED citations, you can
say just:
$io = Bio::Biblio::IO->new('-format' => 'pubmedxml',
'-data' => $citation);
Both "medline2ref" and "pubmed2ref" results are objects defined in the
directory "Bio::Biblio".
SEE ALSO
· An example script examples/biblio.pl. It has many options and its
own help. The relevant options to this IO module are -f
(specifying what file to read) and -O (specifying what result
format to achieve).
· OpenBQS home page: http://www.ebi.ac.uk/~senger/openbqs
· Comments to the Perl client:
http://www.ebi.ac.uk/~senger/openbqs/Client_perl.html
FEEDBACK
Mailing Lists
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably
to one of the Bioperl mailing lists. Your participation is much
appreciated.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/wiki/Mailing_lists - About the mailing lists
Support
Please direct usage questions or support issues to the mailing list:
bioperl-l@bioperl.org
rather than to the module maintainer directly. Many experienced and
reponsive experts will be able look at the problem and quickly address
it. Please include a thorough description of the problem with code and
data examples if at all possible.
Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution. Bug reports can be submitted via the
web:
http://bugzilla.open-bio.org/
AUTHOR
Martin Senger (senger@ebi.ac.uk)
COPYRIGHT
Copyright (c) 2002 European Bioinformatics Institute. All Rights
Reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
DISCLAIMER
This software is provided "as is" without warranty of any kind.
APPENDIX
The rest of the documentation details each of the object methods.
Internal methods are preceded with a _
next_bibref
Usage : $citation = stream->next_bibref
Function: Reads the next citation object from the stream and returns it.
Returns : a Bio::Biblio::Ref citation object, or something else
(depending on the '-result' argument given in the 'new()'
method).
Args : none
_load_format_module
Usage : $class->_load_format_module ($format)
Returns : 1 on success, undef on failure
Args : 'format' should contain the last part of the
name of a module who does the real implementation
It does (in run-time) a similar thing as
require Bio::Biblio::IO::$format
It throws an exception if it fails to find and load the module (for
example, because of the compilation errors in the module).
_guess_format
Usage : $class->_guess_format ($filename)
Returns : string with a guessed format of the input data (e.g. 'medlinexml')
Args : a file name whose extension can help to guess its format
It makes an expert guess what kind of data are in the given file (but
be prepare that $filename may be empty).
perl v5.14.1 2011-07-22 Bio::Biblio::IO(3)
