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  Function: no-op.  this is here only for interface compatibility
  Returns : undef
  Args    : none

=head2 contains

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

=head2 cursor

  Title   : cursor
  Usage   : $obj->cursor($newval)
  Function: holds position in reference collection
  Returns : value of cursor (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head2 twig

  Title   : twig
  Usage   : $obj->twig($newval)
  Function: holds an XML::Twig instance.
  Returns : value of twig (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head2 ids

  Title   : ids
  Usage   : $obj->ids($newval)
  Function: store pubmed ids resulting from find() query
  Returns : value of ids (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head2 collection_id

  Title   : collection_id
  Usage   : $obj->collection_id($newval)
  Function:
  Returns : value of collection_id (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head2 count

  Title   : count
  Usage   : $obj->count($newval)
  Function:
  Returns : value of count (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head2 query_key

  Title   : query_key
  Usage   : $obj->query_key($newval)
  Function: holds query_key from ESearch document
  Returns : value of query_key (a scalar)
  Args    : on set, new value (a scalar or undef, optional)

=head1 BUGS AND LIMITATIONS

=over 4

*
More testing and debugging needed to ensure that returned citations
are properly transferred even if they contain foreign characters.
*
Maximum record count (MAX_RECORDS) returned currently hard coded to
100K.
*
Biblio retrieval methods should be more tightly integrated with
L<Bio::Biblio::Ref> and L<Bio::DB::MeSH>.

=back

=head1 SEE ALSO

=over 4

=item *

Pub Med Help

http://eutils.ncbi.nlm.nih.gov/entrez/query/static/help/pmhelp.html

=item *

Entrez Utilities

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

=item *

Example code

F<eg/biblio-eutils.pl>

=back

=head1 FEEDBACK

=head2 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

=head2 Support

Please direct usage questions or support issues to the mailing list:
I<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.