---
name: "Bio::DB::Biblio::pdf"
section: "3pm"
platform: "linux"
package: "bioperl"
version: "1.5.2.102-3"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/Bio::DB::Biblio::pdf"
---

# Bio::DB::Biblio::pdf(3pm)

Bio::DB::Biblio::pdf - Fetch PDF for a PubMed ID Do not use this object directly, it is recommended to access it and use it through the *Bio::Biblio* module:

```
  use Bio::Biblio;
  my $biblio = new Bio::Biblio (-access => 'pdf');
```

This object contains the real implementation of a Bibliographic Query Service as defined in Bio::DB::BiblioI. Bio::DB::BiblioI is not implemented as documented in the interface, particularly the *find()* method, which is not compatible with PubMed's query language.\
 **Mailing Lists** User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to the Bioperl mailing list.  Your participation is much appreciated.

```
  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
```

**Reporting Bugs** Report bugs to the Bioperl bug tracking system to help us keep track of the bugs and their resolution. Bug reports can be submitted via the web:

```
  http://bugzilla.open-bio.org/
```

Allen Day \<allenday@ucla.edu\> Copyright (c) 2004 Allen Day, University of California, Los Angeles. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. This software is provided "as is" without warranty of any kind. Of course, you'll need access to the sites hosting the PDFs to download them.

\= item \*

If you're having problems retrieving PDF from a site you have access to, you might try adjusting the *max\_depth()* attribute.  It is default set to 3, and affects how many links deep will be recursively followed in page fetches to try to find your PDF.

```
 Pub Med Help
 http://eutils.ncbi.nlm.nih.gov/entrez/query/static/help/pmhelp.html
```

```
 Entrez Utilities
 http://eutils.ncbi.nlm.nih.gov/entrez/query/static/eutils_help.html
```

The main documentation details are to be found in Bio::DB::BiblioI. Here is the rest of the object methods.  Interface methods first, followed by internal methods.\
 **\_initialize**

```
 Usage   : my $obj = new Bio::Biblio (-access => 'pdf' ...);
           (_initialize is internally called from this constructor)
 Returns : 1 on success
 Args    : none
```

This is an actual *new()* method (except for the real object creation and its blessing which is done in the parent class Bio::Root::Root in method \_create\_object). Note that this method is called always as an *object* method (never as a *class* method) - and that the object who calls this method may already be partly initiated (from Bio::Biblio::new method); so if you need to do some tricks with the 'class invocation' you need to change Bio::Biblio::new method, not this one.\
 **get\_next**

```
  Title   : get_next
  Usage   : $xml = $biblio->get_next();
  Function: return next record as xml
  Returns : an xml string
  Args    : none
```

**find**

```
  Title   : find
  Usage   : $biblio = $biblio->find(1234);
  Function: perform a PubMed query by PubMed ID
  Returns : a reference to the object on which the method was called
  Args    : a PubMed ID
```

**exists**

```
  Title   : exists
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

**destroy**

```
  Title   : destroy
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

**get\_vocabulary\_names**

```
  Title   : get_vocabulary_names
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : empty arrayref
  Args    : none
```

**contains**

```
  Title   : contains
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

**get\_entry\_description**

```
  Title   : get_entry_description
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

**get\_all\_values**

```
  Title   : get_all_values
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

**get\_all\_entries**

```
  Title   : get_all_entries
  Usage   : do not use
  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none
```

*depth()*

```
 Usage   : $obj->depth($newval)
 Function: track link recursion depth
 Example :
 Returns : value of depth (a scalar)
 Args    : on set, new value (a scalar or undef, optional)
```

*max\_depth()*

```
 Usage   : $obj->max_depth($newval)
 Function: how far should link recursion go?
 Example :
 Returns : value of max_depth (a scalar)
 Args    : on set, new value (a scalar or undef, optional)
```

*ua()*

```
 Usage   : $obj->ua($newval)
 Function: holds an LWP::UserAgent instance
 Example :
 Returns : value of ua (a scalar)
 Args    : on set, new value (a scalar or undef, optional)
```

*pdf()*

```
 Usage   : $obj->pdf($newval)
 Function: holds pdf data
 Example :
 Returns : value of pdf (a scalar)
 Args    : on set, new value (a scalar or undef, optional)
```